Using these two pieces and some other stuff, I made a mousemat, that would work best with a non-optical mouse.
Step 1: Ingredients:
1x USB cable, old camera cable etc, with the end cut off..
1 or 2x Blue/ green LED (ones that work on 5volts.)
1x White insulating tape
1x Soldering iron (OPTIONAL)
1x multimeter, optional, but really useful..