Tutorial: Vanillicon cosmetic surgery. Put a smile on that.
you can preg_replace the image string and give all your users the same face with different colors.
Remove unwanted facial hair,,, (char 6)
keep the gals from getting moustaches. by checking for gender and moustache.
get dental surgery (char)
correct strabismus http://en.wikipedia.org/wiki/Strabismus
tired of the color purple (char 9)
tilt the head a bit (char 5)
want everyone on your site with the same face but a different color just replace a char or two in string.
WARNING: cosmetic surgery is not for everyone, consult your doctor first.
oops: meant to post it here: http://vanillaforums.org/addon/vanillicon-plugin
need a surgical plugin or a facelift for your site you know who to call.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.