Bat Mitzvah Themes N Centerpieces

Hi im 12 and my name is Meg and i switched my bat Mitzvah theme a couple of times but one i set my heart on waz like musical eras for ex. 50`s sock hop, 60`s flower power, 70`s disco and a different music era at each table, but i cant seem to find good and coohesive senterpices for each that will all go and not look like i just pulled them all out from the air and i cant find anythat go, i dont know what to do, PLZ HELP