Facebomb is an avatar creator that works without the need to install anything on your computer. You can access it from anywhere that has an Internet connection.
You can add three different kinds of effects: decorative pictures (angels, graffiti, animals, toys, make-up, etc.), general effects (photos in black and white, sepia, blurred focus, high contrast, charcoal, etc.) and with text superimposed.
Facebomb also incorportes tools for cropping the photo, rotating it and giving it rounded corners.