i know these DIY has been done many many times by all shape size and forms. well i wanted to see what's its like to make one so here you go. 
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This was created using two Foam paper (white & black). At first I wanted to spray paint the back side of the white to black, but decided not too because I like the thickest of it. I am not a fun of sticking anything on the flash, so i created my own scrap, similar to the one Gary Fong is using.. added some Velcro and I am good to go. The front diffuser was something i purchased at art and craft store... called Simply Stencils... i think its use for sewing. I did so some testing on it yesterday... sorry the subject is my dog. my wife and baby son are out of vacation this week visiting her side of the family. actually because they are not here, i finally have some time on my own to do some things. heheh!
The bouncer size 6" wide and 6.5" but only 5" is actually being use by the lights and the diffuser is 5" wide and from the bottom up its 4"
Here's a link to the test i did...
http://www.jklimagery.com/test/
john
