How about a 50's theam or a Autumn theam:) Hope I helped!

last year our schools prom theme was "a night in paris". we ordered this eiffelt tower kit from somewhere and built a replica of it, and draped lights all throughout the dancehall and set up little cafe tables, and the entry way had a bridge going over it, and the floor was covered in blue plastic underneath to look like water, and we built a cardboard gondola and everything. it was pretty cool. maye you could do something like that.