Perler beads are those plastic beads you put on a pegboard and melt with an iron to make stuff. They lend themselves naturally to pixel-style artwork. In particular, it is very easy to make video game sprites with them.
You can see some of the ones I’ve recreated already, or if you have a request for one before the LAN, let me know and I’ll try to make it. Keep all requests at 29×29 or lower. 8- or 16-bit sprites work best.