Montage-a-google is a simple web-based app that uses Google's image search to generate a large gridded montage of images based on keywords (search terms) entered by the user. Not only an interesting way of browsing the net, it can also be used to create desktop pictures or even posters.
This is a really easy to use web-site that is kind of fun to play around with and see what kind of montage's you can make. As you can see on theire website some folks have used this to make posters for their children's room.
I was able to use it to pull together quite a few pictures from my previously favorite show "The Screen Savers" from TechTV.