diff --git a/goban.lua b/goban.lua
index 61c94bf..7268a5d 100644
--- a/goban.lua
+++ b/goban.lua
@@ -3,7 +3,30 @@ local include, nodecore
     = include, nodecore
 -- LUALOCALS > ---------------------------------------------------------
 
+local is_corny_pattern = {}
+
+local function edgify(s)
+	return string.gsub(s, "nc_concrete_pattern_corny.png",
+		"nc_concrete_pattern_edgy.png")
+end
+
+nodecore.register_on_register_item(function(_, def)
+	if not def[is_corny_pattern] then return end
+	local tiles = def.tiles
+	if not tiles then return end
+	while #tiles < 6 do tiles[#tiles + 1] = tiles[#tiles] end
+	for i = 3, 6 do
+		local t = tiles[i]
+		if type(t) == "string" then
+			tiles[i] = edgify(t)
+		elseif type(t) == "table" and t.name then
+			t.name = edgify(t.name)
+		end
+	end
+end)
+
 nodecore.register_concrete_pattern({description = "Crossy"})
 nodecore.register_concrete_pattern({description = "Starcrossy"})
 nodecore.register_concrete_pattern({description = "Edgy", paramtype2 = "4dir"})
-nodecore.register_concrete_pattern({description = "Corny", paramtype2 = "4dir"})
+nodecore.register_concrete_pattern({description = "Corny", paramtype2 = "4dir",
+	[is_corny_pattern] = true})