I am starting to try to figure out our centerpieces. fiance and i love something like this:

(our colors are shades of purple/lavendar and platinum). our venue provides votives with glass holders like the ones around the pictured centerpiece above and a large vase with a floating candle (as pictured only larger) and we will be having a black tablecloth with undecided color of table runner (either a light shade of purple or platinum). we would just need to buy the flowers. however, i want something else to go with this look as it is a bit plain to me. i thought maybe a mirror to place the vase on and some flower petals would be pretty....
anyone have suggestions?? we are trying to save money by not having monstrous flower centerpieces and i am not very DIY-capable....
also, i would love to see your centerpiece inspiration pics or DIY centerpiece projects!!! i have been obsessed with looking at different centerpieces lately and would love to see what everyone has been working on.