Ok, maybe an app that lets you stream all available episodes of Futurama would be cooler, but this app allows you to fulfill your third-greatest fantasy: creating a cartoon likeness of your head in a pickle jar on your phone. The app also has a selection of alien and robot heads and features to let you experiment with your creativity.
The app does things right by not just keeping the images saved in the app, but also allows you to use the jar heads (not to be confused with Jarhead) as background images or set them as contact photos for the people you're modeling them after. Or you could make a squid monster head for your wife's contact photo. Doesn't matter to me.
The app is free on the Play Store right now.