Have your guests hold mason jar lanterns with led candle lights for your send off.Mason Jar Garden Lights DIY Lids Set by TheCountryBarrel I can do this for the backyard! Switch out candles for battery or LED candles.
Repurposed Wine Bottle Ideas Idea Box by Creatively Living
you can get the vases at Dollar Tree, 3 bags of rocks and the floating candles in a 6 pack at Hob Lob. With a super gorgeous orchid as the flower, in the colors of the wedding, you've got yourself a very pretty, and very thrifty centerpiece!