Well, take the original image of the face, and make a couple of PNG (24bit) images with different colors (and opacity of course), then it's just a matter of a couple of PHP lines, link to the PHP file and you're set

. I basically use this method for my sig below, and my 'wild western-wannabee gallery script' I made a while back ().
Pretty neat

. Now if you'll excuse me, I'm going back to Day of Defeat on my couch, wireless, with a device that's only 16cm. wide

. ()
Don't we just love technology

. (got it today!)