DSLR pop-up flashes are very usefull when you do not want to carry your large hot shoe flash around, but are quite limited in both power and control. They tend to make harsh shadows and blow out close subjects.
To make photos more pleasing, many people use a diffuser.
You could buy one, but most people make them They are homebrewed with everything from a simple sheet of paper to plastic cards and even fancy "origami" folded papers.
This is yet another diffuser, but I think it shines by it's simplicity. It's made from something almost all photographers have in the bottom of a drawer... a film canister.
Step 1: Measure your flash and cut the canister
Well, this step is simple... pop up the flash on your DSLR and measure the depth of it's base. You need this to know how wide to make the cut on the film canister.
Then grab your canister, a box cutter or X-Acto knife and cut a slit down the side of the canister. Make sure that slit is barely wider than your flashes stalk.