Cross stitch and plastic canvas too, like these cross stitch pinback buttons by pOOm plastic:
How about mosaic? Yeah, we got that. By popmaw
The coolest thing about these is that they are all super easy to make. That's right, you can do it! I especially recommend trying out perler beads and plastic canvas, they are very handy for making all kinds of cases, i.e. for your DS or your ipod. And remember, what I've shown here is just the tippity tip top of the iceberg.