This bride wanted to use a variety of jewel-toned colors in her floral material. We accommodated her request with deep blue and white hydrangeas, hot pink and yellow roses, hot pink gerber daisies, pink alstroemeria, white lilies, yellow calla lilies, topped with curly willow. Then we complemented the main centerpieces with other table settings of hot pink roses sunk in water on top of a foundation of clear glass stones topped with floating candles.
Photos by Kerry Brooks Photography http://www.kerrybrooksweddings.com Trio of floating candles with fall twigs/leaves and rocks to add interest. Backdrop is just vertical string lights behind sheer fabric
Submerged arrangements like this can be stunning and cost effective. We could do a mixture of something like this, only as you suggested, with more vases (I think 5) on each table, for half of the tables, then fuller low centerpieces for the other half. And candlelight all around! Also, these could be repurposed to line the aisle during the ceremony.