If you're like me, you need pics with Pi. Here are some of the pics I've found on the internet.
Also, I found a good program called Giffy that can make backgrounds transparent in .gif or .bmp files. It can also reformat .gif to .bmp, and vice versa. A very small, simple program, but efficient.

This may look like the author got the digits wrong, but it's actually the value of 22/7.

^ Good for a desktop background

^Good background

Good for (^) text use

^ yet another good background

Also good (^) for text use