It's possible to collect random photos and display them, too. See Dgrin's header for example.
The code used:
<div class="left_image"><a href="http://dgrin.smugmug.com/gallery/2241567" target="_new"><img src="http://dgrin.smugmug.com/photos/random.mg?AlbumID=2241567&AlbumKey=tCUxz&Size=150x150" alt="Left Image" title="One of Dgrin's Favorite Shots" /></a></div> <div class="center_image"><a href="http://dgrin.smugmug.com/gallery/167709" target="_new"><img src="http://dgrin.smugmug.com/photos/random.mg?AlbumID=167709&AlbumKey=v3S3q&Size=150x150" alt="Center Image" title="One of Dgrin's Favorite Shots" /></a></div> <div class="right_image"><a href="http://dgrin.smugmug.com/gallery/995228" target="_new"><img src="http://dgrin.smugmug.com/photos/random.mg?AlbumID=995228&AlbumKey=GPZqP&Size=150x150" alt="Right Image" title="One of Dgrin's Favorite Shots" /></a></div>