Re: That reminds me..
Well remember that you may be hosting the images, but it's the other guy that's publishing them It makes a difference. If you're after one-size-fits-all though, images might not be the way to go. .htaccess to open an iFrame/div/table containing text would probably be better (and use less bandwidth, if that's a concern)....with images your one image is going to get squashed to the proportions of your various hotlinked images, so it won't look very good most of the time.
Ironically, it's often people who have a moral agenda who nick your stuff. Which makes it all the more rewarding when you goatse them.