The custom backgrounds that I have created that you can use too
I have fun with these little backgrounds, and I periodically create and print new ones. I think they do a great job adding some additional fun / pizzaz to your photos.
I print all my backgrounds on a little Poloroid ZIP:
I created all these myself in photoshop and they are not copyrighted, so you may use them in any way you'd like.
Here are some examples of photos that I've taken using some of the backgrounds listed above.