It's also a bit of fun and a work-in-progress...
Select your faces from the dropdowns top-left or hit Luckydip, then simply click-and-drag.
Play with the controls top-right for an almost infinite number of effects. The Gallery and Randomize buttons are a good start.
Do try the different Animation styles as well!
Happy with your creation? Hit Send/Save and copy the link to save it or send it to the world.
Using the Add Your Own Photos buttons you can drag-and-drop images from your desktop, edit them and share!
You can also hit enter at any time to take a snapshot.
Turning on Go Mental and/or Trails produces some interesting results too.