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.
Lisianthus --- The first thing lisianthus plants are known for are their beautiful bell-shaped flowers. Unfortunately, the second thing lisianthus plants are known for is being notoriously difficult to cultivate