Help I need ideas on centerpieces....***?

My coors are caribbean, jewel or a turquoise blue basically with white. I need ideas on centerpieces that incorporate these colors but not to dramatic and not to big but not to small =) im so picky and I do not know what to do? I was thinking places round mirrors on all tables and placing a vase with white roses in them and then incorporating blue candles and beads??? Helppp Pictures would be helpful..Thanksss