This shows how to use an ordinary set of pliers as a hobby clamp (in a pinch anyway).
Ultimately I believe this is worthy of winning a random prize in the tool tip contest.
Step 1: Get your materials
You will need a pair of pliers and a strong elastic band. I took my band from a bunch of broccoli, so it was FREE.
Make sure your rubber band is strong or it won't have the strength to clamp very well.