The Goodies section also lets you add objects, hats, speech bubbles or other shapes. Photos can be saved or shared online.
I upload a photo of my kitty "Echo".
Here are a few of the free effects that I did with the above photo.
No registration is required and the site is free. They do offer a paid version that removes their logo and provides additional tools but I found that the free version had enough goodies for an afternoon of entertainment.