This is a repost of something I put in the critique section, as I want folk to experiment for me, and with me. (So to speak. Just not ON me) My name is Pete, and I am a cheapskate. Don't invest in foamcore stuff - take a look at the big block of polystyrene foam that came with your TV, hifi, printer, whatever. Often it is big enough to stand on its edge, and it can make a fantastic "dish reflector" for macro work and flash portraiture, especially as flash may reflect off the walls of the cavity as well as the back, thus diffusing the light even more. Sometimes the largest face has a big hole in it. This can make a good surround-/ring-flash effect, especially if you mount the subject within the hole - you can get 4-directional soft backlight, all sorts of different effects. Of course, I can't prove any of this waffle, it has been decades since I last did it, but maybe people could experiment and post results here?