diff --git a/init.lua b/init.lua
index d2af8ea..2314bf5 100644
--- a/init.lua
+++ b/init.lua
@@ -321,7 +321,7 @@ function internal.clean_deco_def(def)
     place("height", "number", 1)
     place("place_offset_y", "number", 0)
     place("replacements", "table", {})
-    place("flags", "string", "")
+    place("flags", "string", "place_center_x,place_center_z")
     place("rotation", "string", "0")
 
     d.height     = math.max(d.height    ,  0)
@@ -575,6 +575,11 @@ function internal.flat_from_node_types(bools, minp, maxp)
                 return nt.floor_deco
             end
 
+            if bools:get_index(i + bools.up) == false then
+                -- Block is near the ceiling
+                return nt.ceiling_deco
+            end
+
             return nt.air
         else
             -- NOT PART OF CAVE
@@ -745,8 +750,12 @@ function internal.generate_caves(data, minp, maxp)
                 place(def.node_wall)
             elseif nt == internal.node_types.ceiling then
                 place(def.node_roof)
-            elseif nt == internal.node_types.floor_deco then
+            elseif nt == internal.node_types.floor_deco or nt == internal.node_types.ceiling_deco then
                 local schem_placed = false
+                local appropriate_place = "floor"
+                if nt == internal.node_types.ceiling_deco then
+                    appropriate_place = "ceiling"
+                end
 
                 if not schem_placed then
                     -- Prevent decorations from spawning in the air
@@ -757,7 +766,7 @@ function internal.generate_caves(data, minp, maxp)
 
                 if not schem_placed then
                     for _, deco in ipairs(noordstar_caves.registered_decorations) do
-                        if deco.place_on ~= "floor" then
+                        if deco.place_on ~= appropriate_place then
                         elseif math.random() > deco.fill_ratio then
                         elseif not internal.is_deco_biome(deco, def.name) then
                         else
@@ -769,7 +778,12 @@ function internal.generate_caves(data, minp, maxp)
                 end
 
                 if not schem_placed then
-                    place(def.node_dust or "air")
+                    local n = "air"
+                    if nt == internal.node_types.floor_deco then
+                        n = def.node_dust or n
+                    end
+                    place(n)
+                    schem_placed = true
                 end
             else
                 error(
@@ -913,16 +927,42 @@ end
 -- Place all schematic decorations into the world
 function internal.place_schematic_decorations(vmanip, schems)
     for _, schem in ipairs(schems) do
-        local pos  = schem.pos
+        local pos  = {
+            x = schem.pos.x,
+            y = schem.pos.y + schem.deco.place_offset_y,
+            z = schem.pos.z,
+        }
         local deco = schem.deco
 
         if deco.deco_type ~= "schematic" then
         else
-            minetest.place_schematic_on_vmanip(
-                vmanip, pos,
-                deco.schematic, deco.rotation, deco.replacement,
-                true, deco.flags
-            )
+            if deco.place_on == "floor" then
+                minetest.place_schematic_on_vmanip(
+                    vmanip, pos,
+                    deco.schematic, deco.rotation, deco.replacement,
+                    true, deco.flags
+                )
+            elseif deco.place_on == "ceiling" then
+                local h = deco.schematic
+
+                if type(deco.schematic) == "string" then
+                    h = minetest.read_schematic(h, {})
+
+                    if type(h) == "nil" then
+                        error("Could not find schematic! Perhaps it the filename is incorrect?")
+                    end
+                end
+
+                h = h.size.y
+
+                minetest.place_schematic_on_vmanip(
+                    vmanip, { x = pos.x, y = pos.y - h + 1, z = pos.z },
+                    deco.schematic, deco.rotation, deco.replacement,
+                    true, deco.flags
+                )
+            else
+                error("Unknown place_on value `" .. deco.place_on .. "`")
+            end
         end
     end
 end
@@ -931,7 +971,11 @@ end
 function internal.place_simple_decorations(flat, schems)
     for _, schem in ipairs(schems) do
         if schem.deco.deco_type == "simple" then
-            local pos  = schem.pos
+            local pos  = {
+                x = schem.pos.x,
+                y = schem.pos.y + schem.deco.place_offset_y,
+                z = schem.pos.z,
+            }
             local deco = schem.deco
             
             local i = flat:pos_to_index(pos)
@@ -1243,84 +1287,104 @@ noordstar_caves.register_shape({
     connectivity_point = 10,
     verticality_point = 40,
 })
--- noordstar_caves.register_shape({
---     name = "noordstar_caves:cliffs",
+noordstar_caves.register_shape({
+    name = "noordstar_caves:cliffs",
     
---     noise_params = {
---         offset = 0.4,
---         scale = 0.5,
---         spread = { x = 20, y = 100, z = 20 },
---         seed = 97354,
---         octaves = 4,
---         persistence = 0.6,
---         lacunarity = 2.0,
---         flags = ""
---     },
+    noise_params = {
+        offset = 0.4,
+        scale = 0.5,
+        spread = { x = 20, y = 100, z = 20 },
+        seed = 97354,
+        octaves = 4,
+        persistence = 0.6,
+        lacunarity = 2.0,
+        flags = ""
+    },
 
---     func = function(pos, n)
---         return n
---     end,
+    func = function(pos, n)
+        return n
+    end,
 
---     connectivity_point = 30,
---     verticality_point = 80,
--- })
--- noordstar_caves.register_shape({
---     name = "noordstar_caves:donuts",
+    connectivity_point = 30,
+    verticality_point = 80,
+})
+noordstar_caves.register_shape({
+    name = "noordstar_caves:donuts",
     
---     noise_params = {
---         offset = 0.0,
---         scale = 1.0,
---         spread = { x = 30, y = 30, z = 30 },
---         seed = 3934,
---         octaves = 1,
---         persistence = 0.6,
---         lacunarity = 2.0,
---         flags = "eased"
---     },
+    noise_params = {
+        offset = 0.0,
+        scale = 1.0,
+        spread = { x = 30, y = 30, z = 30 },
+        seed = 3934,
+        octaves = 1,
+        persistence = 0.6,
+        lacunarity = 2.0,
+        flags = "eased"
+    },
 
---     func = function(pos, n)
---         return 1 - 2 * math.abs(n)^0.5
---     end,
+    func = function(pos, n)
+        return 1 - 2 * math.abs(n)^0.5
+    end,
 
---     connectivity_point = 50,
---     verticality_point = 40,
--- })
--- noordstar_caves.register_shape({
---     name = "noordstar_caves:wall",
+    connectivity_point = 50,
+    verticality_point = 40,
+})
+noordstar_caves.register_shape({
+    name = "noordstar_caves:wall",
 
---     func = function(pos, n)
---         return -0.5
---     end,
+    func = function(pos, n)
+        return -0.5
+    end,
 
---     connectivity_point = 0,
---     verticality_point = 0,
--- })
+    connectivity_point = 0,
+    verticality_point = 0,
+})
 
 -- noordstar_caves.set_world_depth(-60)
 -- noordstar_caves.cave_vastness = function(pos) return math.abs(pos.y - 60) / 120 end
 
 noordstar_caves.register_biome({
-    name = "test",
+    name = "nc:glowing_floor",
     node_floor = "mcl_core:crying_obsidian",
     node_wall = "mcl_core:sand",
     node_roof = "mcl_ocean:sea_lantern",
     node_dust = "mcl_core:snow",
-    heat_point = 80,
-    humidity_point = 80,
+    heat_point = 20,
+    humidity_point = 0,
 })
 noordstar_caves.register_biome({
-    name = "test2",
+    name = "nc:crazy_glowin_walls",
     node_floor = "mcl_amethyst:amethyst_block",
     node_wall = "mcl_crimson:shroomlight",
     node_roof = "mcl_colorblocks:glazed_terracotta_silver",
     heat_point = 100,
+    humidity_point = 0,
+})
+noordstar_caves.register_biome({
+    name = "nc:regular",
+    heat_point = 50,
+    humidity_point = 50,
+})
+noordstar_caves.register_biome({
+    name = "nc:cold",
+    node_dust = "mcl_core:snow",
+    node_roof = "mcl_core:ice",
+    heat_point = 10,
+    humidity_point = 100,
+})
+noordstar_caves.register_biome({
+    name = "nc:grass",
+    node_floor = "mcl_core:dirt_with_grass",
+    heat_point = 50,
+    humidity_point = 70,
+})
+noordstar_caves.register_biome({
+    name = "nc:dangerous_lava",
+    node_floor = "mcl_core:lava_source",
+    y_max = -40,
+    heat_point = 100,
     humidity_point = 100,
 })
--- noordstar_caves.register_biome({
---     name = "test3",
---     heat_point = 50,
---     humidity_point = 50,
--- })
 
 noordstar_caves.register_decoration({
     deco_type = "simple",
@@ -1329,21 +1393,22 @@ noordstar_caves.register_decoration({
     decoration = "mcl_core:cactus",
     height = 3,
     height_max = 8,
-    biomes = { "test" },
+    biomes = { "nc:glowing_floor" },
 })
 noordstar_caves.register_decoration({
     deco_type = "simple",
-    place_on = "floor",
+    place_on = "ceiling",
     fill_ratio = 0.1,
     decoration = "mcl_ocean:sea_lantern",
     height = 1,
     height_max = 4,
-    biomes = { "test2" },
+    biomes = { "nc:crazy_glowin_walls" },
+    place_offset_y = -3,
 })
 noordstar_caves.register_decoration({
     deco_type = "schematic",
     place_on = "floor",
-    fill_ratio = 0.005,
+    fill_ratio = 0.001,
     schematic = squeak,
     rotation = "random",
     -- place_offset_y = 5,