100 ISO, 15 second exposure at F22. The result was mainly white, so I did an auto-exposure in ACDSee. My 10D's sensor is pretty dirty, so I had to remove about a hundred dust spots from the result with The Gimp. I also blurred the result, but just slightly.
I was actually just doing a test to see how much dust I had on my 10D sensor. Instead of just pointing my camera at a white wall, I decided to wave it around - this was the result.