Thanks Andy. My problem is finding a good image and making it sort of like 'in the background' rather than being way too 'out there', if you know what I mean!
I'm not a graphics person, so I'm trying to get one particular image to have like a haze over it or something to tone it down and make it look like it belongs in the background and not as a full image.
The image is at
http://farm3.static.flickr.com/2350/...1c7431.jpg?v=0
...oh, and then there's the issue with sizing. Is there anything special as far as the sizing goes?