Says-It.com image maker
"Says-It.com image makers allow you to create your own funny photos and graphics - simply type in some text and choose from a few simple options. ... Once you've picked your options and created your image, you can use it for whatever you like - save it on your computer, upload it to ImageShack image hosting for use in blog or forum posting, or have it applied to a variety of high-quality merchandise from Zazzle.com, including stickers, mugs, keychains, and magnets."
The "Official Seal" and "Official Badge" makers are an easy way to create button designs. They are also nice "eye candy" for worksheets or other handouts.