Check out Flickr member Muzzlehatch‘s instructions for making a "light bouncer/diffuser for a camera-mounted external flash to use on macro shots". Here’s the first step, be sure to view all the steps in the MuzzBounce™ Ghetto Flash modifier set. Via Strobist

"This reflector panel holder made of 3/4 inch PVC pipe is handy if you have a spare tripod to use. The tripod provides a stable base that can be adjust for height and tilt angle. Reflector is the collapseable type used for an auto windshield (31 x 38 inches)…" Continue reading at DIYphotoraphy.net Via MAKE [...]