Great thread! I just had a brief look at the Nyan one and wow. Huge ravines and caves everywhere! Just one suggestion for the thread though, could you possibly arrange the maps into a list on the first post, and add any others that turn up during the thread to the front post, as the thread is getting quite bit now, and I don't know if any others have been added that I've missed out on. So far I have Artomix, Artomix 2 aka Forest, and Nyan (all water, I'm not jailbroken).
You can now use Nyan Lava Edition for 0.3.3, Fire bug was fixed! And yes theres only 4 maps avaliable