Very cool. Makes me think of RAMA. I've been playing with ideas, trying to figure out how to "stretch" the shader. ShaderOps "tile UV's" can make it cover more space. But what I'd really love to do is re-seed the random number generator on a per-tile basis. After all, nothing on this shader is hand-placed; it's all random numbers. Anyone want to ask Eric Winemiller if he could write something that re-seeds all the generators in a shader tree?