I have a small point-and-shoot camera, but it lets me get pretty close for macro shots. The problems are that the flash is either ON or OFF, there is no 50% flash, 25% flash, etc. When I'm one or two inches from a bug 100% flash is way too much. Also, the flash is a small "point source" on one side of the lens giving lighting from only a small angle. Some flash diffusion, reduction, and a ring-light would be nice. But, I only have a cheap camera that can't do much and I'm not willing to pay more for attachments than I was for the camera itself (someday I'll buy a better camera and get attachments for it).

Phase one, reduction and a little diffusion
I tried blocking the flash a little with part of my finger to reduce to flash 50% or so, and this worked pretty well sometimes, but the light that traveled through my finger sometimes hit the subject and added a red light.
Then came the Styrofoam block
I used a utility knife to hollow out a block of Styrofoam to fit the camera. By making the hole off-center I was able to flip it over to select two different thicknesses.