There's no denying the inherent coolness of image mosaics. If you haven't heard the term, they're those insane images that are made up of hundreds of other scaled-down images. Zoom out, and it looks like something recognizable (like Paper Mario, for example).

Click7.org has a slick online generator that automatically creates mosaics from your uploaded images, and it works well. Processing only takes a few moments and your completed image can, of course, be downloaded. You can also zoom in and out - from 50% to 200% - on your image to see how it looks at different sizes.

To achieve the best results, use fairly large originals - Mario was 1280 pixels high, and turned out rather nicely.

For more mosaic fun, you might want to take a look at the Flickr-based Mosaickr.