Ranunculus Centerpiece: candles, vase of soft pink ranunculus, a mirror becomes a pool of reflective light that casts a glow onto the reception tables.: Wedding Centerpiece Ideas by Color -- Martha Stewart Weddings
Paper lanterns as light-up centerpieces--inexpensive idea. Slip a Vase in the middle of each lantern and add flowers of choice. OR just adhere silk flowers to top edge of lantern.Put BATTERY OPERATED CANDLES/lighting inside and around each lantern.
A fun cake filled with a colorful sweet surprise that tumbles out when you cut into it, revealing to your eager guests if the baby-to-be is a girl (pink) or a boy (blue)! --Best gender reveal idea I've seen.
I did this with red and white candles. It turned out super cute for the first stretch of the candles being lit, but once they started melting down and getting shorter, it wasn't as cute and now I just have a little metal bucket full of wax.