Buy a few dozen pink lawn flamingos. About 3 dozen would be good. Then at night select church members homes to place the flamingos at. Leave a note letting them know the youth group will come remove the flamingos for a set price. Like ten dollars. The students will get a kick out of sneaking around setting the flamingos up and it will raise money as well! It would probably be best to inform the church about the fund raiser before hand! Perhaps people would even sign up their homes.