Don't know how big you are on white flowers, but I love the idea of silver mirrored vases for centerpieces.
west elm mixed hammered vase collection, $34.00
white wedding centerpiece ideas via stacy able photography
A personal favorite from my Etsy shop https://www.etsy.com/listing/452896578/silver-vases-silver-and-royal-blue-baby
I have so many cheap vases that I don't have a use for, have to do this and make them pretty.
Vintage silver vases and bottles as #centerpieces #silver #vintage
Another faux mercury vase tutorial.
I love a small centrepiece so guests can see eachother and conversion is easier. Put hydrangeas in a short vase. Probably do a shade of blue or purple for my wedding :)
A display of Silver Metal - group together as a focal point
White Wedding at Houston Station in Nashville | Flowers by Enchanted Florist, Photo by EB Photography + Artistry