you can get the vases at Dollar Tree for $1 each. 3 bags of the rocks at $1 each, and the floating candles in a 6 pack for $2.99 at Hob Lob. With the flower, in the colors of the season, you've got yourself a very pretty, and very thrifty centerpiece! I may have to use this idea!
Simply inflate a ballon, wrap several sets of thread or yarn around it, and spray fabric stiffener all over. Once the thread has dried completely, simply pop the balloon and you're left with a gorgeous, unique wedding decoration.