Option One: Pomander on vase with crystals
The pomander would be made out of tissue paper and probably in a cream-ish color. I would put a ribbon around the bottom of the pomander and the crystals would be black or purple.
Option Two: Hydrangeas
I originally wanted to stay away from fresh flower centerpieces because of the cost, but if I order hydrangea wholesale from Blooms by the Box @ just under $4/stem, the price for 11 centerpieces won't be so bad. Additionally, the bridesmaids bouquets are going to be hydrangeas with peacock swords instead of greenery filler. The centerpieces would be white hydrangeas with a few peacock eyes in them. Maybe a ribbon around the center of the vase?