Step 1: Aquire a USB Flashdrive
Step 2: Remove the casing
There are different colored circuit boards depending on the manufacturer. The most common colors of the circuit board are Red, Green, and Blue.
Step 3: Cover USB Drive in Hot Glue
After the glue is dry, pick up the drive and turn it over. Take the hot glue and cover that side. Try to get it as close to the edges of the other layer as possible. If necessary, you can shave the edges with a razor blade to match them up. If you shave too much, the edges will look dull and flat. You can run the edges of the drive over the tip of the glue gun to melt them and make them shiny again. Note that this will add a slight lip to the edges.