A few links for some great online image manipulation sites. Things have sure gone far.
Pixlr: Basically, a free, online Photoshop. Great, very robust.
Pixlr-o-matic: Kind of like Instagram, just not tied to a mobile device and with more personality and variety, too. Facebook app.
Poladroid: Make Polaroid pictures out of any kind of pictures. Genius. You can even shake the Polaroids to make them come out quicker!