1. Image Mosaic Generator
“If an image is worth a thousand words, an image mosaic is worth a million words.” Just upload a picture and it will be made into a mosaic with hundreds of smaller pictures.

2. Vector Magic
Converts bitmaps into very versatile vector images that you can resize quite easily.

3. Ad Generator
Ever wanted to create a quick advertisement? This will do it for you almost effortlessly; just provide an image.

4. Rasterbator
Wanted to create larger images from your files? You can do this with this service.

5. Video Maru
Easily create Flash videos with this user-friendly interface.

Know of any others? :)

EDIT: Word cloud's? It's a pretty cool site using words to create images.