I am not capable of creating an app, but have an usefull and fun request.
The idea would be to random select a winner of a contest you do on facebook. So you can show live who has won and make it fun to watch while running the random select.
Create a push button app that
0/Get the first letter of all your likes/followers page
1/scrolls these letters till you hit the button.
2/displays the first letter
3/get the second letter of the remaning likes/followers on your page
4/scroll these letters till you push
5/display first and second letter.
continue till you have a winner.
parameter field to fill in:
-start date (select which people can win)
-end date (by adding dates, you can run also new contests, more flexibility)
Happy to hear your remarks.