I'm not sure how this is on the copyright side of things, but Mokazon has created a 'fan art' version of Minecraft using the Blender Game Engine!
Update: .Blend download added!
Recently, I've been making a blender game engine version of minecraft, just for fun - as a sort of BGE demo. Here's a video of how it looks:
I'll upload the .blend perhaps soon after I fix a few minor glitches and optimizations and then put the link in the video description.