As a great craft idea and a fun and interesting fundraiser, building a bank with your youth is an awesome idea!! You always see those coin banks in stores that go in an interesting track, or the gumball machines were the gumball goes down a spiral, so why not make one? Take paper towel and toilet paper tubes (empty, of course), and cut them up to make a track that coins of all sizes will fit down. Attach it to a jar of some sorts and put it somewhere that gets a lot of traffic. This activity is a great group project, a great time-consumer and a fun way for all ages to donate their spare change!