Something completely different to do with spools of thread.

By pure chance, I stumbled across this a while ago - someone doing incredibly awesome art with thread. But in a completely different way than expected:

This is one of the pieces Devorah Sperber makes, and it boggled my mind. You can see more of her work showcased here - and it really, really is worth a look.

Now if I had space and money for a few thousand spools of yarn and an acrylic ball...