I remembered my son installed this CamWow app on my phone a few years ago. It's still as funny to do now as it was then. You've got to try this app.

This app can morph, color, stencil, and a ton of other ideas you have to make boring photos more fun. It's hilarious taking a pic of somebody who has no idea what you've done on the other side of the camera. Guaranteed to make them bust a gut when they see it.