So Battlefield 4 has a cool custom emblem creator. It works pretty much the same way as Forza's livery editor but it's limited to only 20 individual layers.
These are the three I've made so far (the Pikachu was done for a friend) it's fun getting to express yourself in game like this, and everyone you kill gets to see the work you've created! Trying to make an image with weird shapes and getting something cool out of it with only 20 layers is tough but really rewarding once you've managed to make it!