I'm afraid we can't force the clouds to be below the terrain - haven't seen that in the protocol - but at least we can try reproducing the cool terrain - islands floating in the sky
I think I've come up with what could be an even better biome generator than Distorted Voronoi.
The Voronoi base stays, it's useful. But instead of Noise-based Distortion we could use an algorithm similar to that of Kai's Power Goo (for those of us who remember

initialized with a regular grid of random vectors. That way there won't be any "overlaps" as in the distortion, so there won't be any "islands" of one small biome completely engulfed in another.
I need to investigate a bit more.
I'm struggling with trees right now. I'd like them to be assorted, like in original MC - small trees, large trees, pines, spruces, birches, jungle trees and jungle bushes. And they all need to be generatable algorithmically, not randomly. Also the number of trees per chunk should be biome-dependent, instead of fixed. Quite a lot of work to do.
Right now the server eats up ~1.5 GB of memory just for generating the chunk, and one chunk takes around 40 seconds to generate. Still want to test?

oww :S nope

but maybe when it uses less memory and generates chunks faster

maybe can you upload some pictures of the generated world
