The finish your flash diffuser, fold your file folder along the marks so that you have five sections. Place the first and last section together, so that you have a three dimensional rectangle as pictured below, and use a little clear packaging tape to attach the edges. Slip the flash diffuser over your camera's flash, preferably so that it points upwards, and start taking pictures.
You need only:
- An opaque file folder, available at most office stores for less than a dollar.
- A pair of scissors, which you probably have already.
- A pen or pencil, which you hopefully have already.
- A strip of packaging tape, or, in a pinch, plain translucent craft tape, which you can find in an office store for less than a dollar.
Keep in mind that you can use plain white paper for this project, but it won't be nearly as sturdy and may not diffuse your flash as effectively.