Nothing fancy Deb.Details of your experiment set up please
I just cut a white glossy, kitchen blotting paper (used by wife to clean off excessive oil from fried stuff) and stapled it around on camera flash. Good for fewer times use only.
I liked the soft and diffused light affect it produced.
The first picture of this post and this post was shot with DIY diffuser.
Setup looked something like this. (Picture copied from web)
I saw some small plastic like diffuser on ebay and may order it soon (not before i check on a local store)