There's no automatic way to do a photomosaic in PSE, but there's the free AndreaMosaic program:
that seems to be the only thing available that can do it.
Here are some others:
If your interested in doing it yourself, the steps in this video should work in photoshop elements 9:
Message was edited by: R_Kelly
Mark & R_Kelley,
Thanks for the other links, guys. It looks as if AndreaMosaic is the only free program still under active development.
Those do-it-yourself Photoshop methods produce an image that is quite different than the "true" photomosaic image -- merely a pattern that's blended on to the original image. A nice effect, but....
Europe, Middle East and Africa