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For this you need GD support.
You can store standard template images for each email service provider and mix text or images over it by using ImageCopy function.
I use this to add a standard image to every image uploaded by the user at http://www.plusrate.com , you can see plusrate.com addded to all the images at bottom.
GD function is very powerfull in PHP and my friend even written a script to add flash images to some pictures at http://www.bannersnbuttons.com/ You can upload a image here and add text over it.