Hmm well you have to have some Beverly Hills 90210 and Melrose Place posters about. Dance music to get people in the mood - Salt 'n Peppa, Black Box, C & C Music Factory, Dee-Lite etc. Or you could head off down the grunge route with Nirvana, Soundgarden inspired themes.

Movies - maybe Ghost, Pulp Fiction, Swingers, Reservoir Dogs, Men in Black.....

I hope that helps a bit