If you ever read Rob Cockerham's site --
www.cockeyed.com -- you may have already seen this idea there.
If you search on Google for image numbers such that a digital camera generates you can find tons of hi-res and vaugly interesting images.
Try these formats:
pic_***
img_***
dsc***
Replace the *** with digits and you get fun stuff like this:
IE:
http://cryptolabs.org/pictures/CCCamp2003/img_1926.jpg
Some of them are kinda spooky:
<img src="http://cryptolabs.org/pictures/CCCamp2003/img_2006.jpg">