Elovalo is a project I have been involved in since the Spring. The goal of our project is to build a couple of led cubes for a week long event held in September. We will place these cubes on pedestals at a central park in Jyväskylä. So far it has been an interesting project. We have tackled most of our technical woes. Still some assembly left.
I've primarily focused on 3D and effect side. I build a small simulator that allows us to render effect code via Blender. The simulator matches actual output somewhat well and has helped us in effect development. It allowed us to design API and develop before we actually got hardware ready. After we tackled our hardware woes, the effect code just worked. You can get some idea of the simulator output by checking our demo video. The real thing looks like this:
There is more information available at the project site. We haven't polished the documentation yet or anything but if you want to build a led cube, that might give you some idea how to do it.