Looking to make a quick and easy collage? Shape Collage Online lets you generate collages in several different shapes. You can put together a heart, moon, circle, square, star, butterfly, paw, or cat shaped collage of your choice, using the images of your choice. All you have to do is include the urls of webpages or photos that you would like built in to the collage. The service is totally free to use. But if you’re looking for a more advanced way to build collages, they also have a paid software version, called Shape Collage Pro, which is available for both Mac and PC.