This is my first demo project.
I'm using Blitz3D - it is totally cute and chicks love it.
It has a Blitz3D theme and is sort of cubey and spherey and rotatey.
EDIT:
Of course it looks better in motion.
Here are a few pics:








EDIT:
I added 3D:

But you need 3D glasses (red/cyan).
It isn't that great an effect, but I tried.
EDIT:
I added shininess to me spheres - I forgot to do that before:

The spheres are inside cubes which rotate around them - so it makes it look like the cubes are not cubes but cubes with circles cut out of the faces. They sort of refract the sphere textures as they rotate - I mention that just in case it isn't obvious from the pictures.