Ambient effects

i have to do a flash project for my class that last 3mins! it must include music, im trying to find the easiest and fastest way to complete this project, i was thinking of added some ambient effects or stuff like that along with maybe some downtempo music…

i checked out the tutorials and found some neat stuff but dont really know what to do with or how to add music, etc

but i guess basically my questions would be, what are some quick and easy suggestions for a long flash animation? are there any places to d/l .fla files? that i can just play with it or what not?