Michael VanDeMar offers some great tips on how to find public domain images and creative commons images.

Sometimes I use Wikimedia Commons to find images, but it can be limited for choice. I'll try out Michael VanDeMar's suggestions on how to find such other free images.

If you can't find what you want for free, then I've used iStockPhoto.com to buy some great photos.

Where do you get your images from?