School's Out! This app counts down to the end of the period, school day, semester, lunch, and 3 events you can set yourself (prom night!). There's a lot of custom features and you can countdown to multiple times at once.
My Graduation Photo This is a frame for your graduation photo - it just says "My Graduation" across the bottom. Not the greatest - but gets the point across.
Spin the bottle (make rules) If you want to play "spin the bottle" but are missing a bottle - this is the app for you. Bring a new spin on an old classic at the party.
Party & Drinking Games This app has hundreds of party and drinking games with rules and easy instructions. You can SMS or email them too.
Party Light Free This is a fun app that turns your phone into a lighting accessory for the party. It's got 7 themes and includes a strobe.