Laser level. Ther are apps that use the orientation sensor in the phone to turn it into a level. Take it a step further. Combine hte orientation sensor and the phone to show a live camera view but draw a level line on it.
This can be taken further (if the phone is accurate enough), to draw a ‘same’ height line on the camera view, useful for hanging pictures and checking the level of things.
Novelty ‘which protein is your name in’. Check human proteome first for good matches, then orangatang, pig, rat, bacteria. Show the protein sequence with the name highlighted, and a picture of the organism.
Allow the user to send this in an email or post on FB.