Sounds great? Then follow this simple instructable and build your own within just a few minutes.
Step 1: Materials
> Cardboard (or box)
> Webcam (any webcam should work. I am using the Playstation Eye Camera due to its high framerate)
> Electrical tape (or ducktape)
> Glass (or transparent acrylic. I am using a picture frame since it already has a glass and makes a nice finishing of the trackpad)
> Plastic cup (or any other cup)
> white sheet of paper (any paper should be fine)
> Hobby knife or scissors to cut things
Step 2: Picture Frame
1. Take apart the picture frame into its three pieces. The frame, the glass and pedestal.
2. Measure the inlet size of the picture frame and cut out an accordingly big piece of paper.
3. Place the paper into the picture frame and put the glass on top.
After this step you should have a picture frame with a white piece of white paper in it. The picture pedestal is removed and replaced by a piece of glass or acrylic.