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
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.
Step 2: Insert the Canister and Use the Camera!
Step 3: Why Use a Diffuser?
Of course since the ligh is diffused, this does limit the reach of the flash... but you are doing this for close up work anyways so thats not a problem.
Diffusing your flash is always a good idea when taking close up pictures to make an instructable.