Hanging light bulbs of different shapes, these are great because of the patterns they create on the surfaces below them. Some of the have far better ascetic looks to the others and could be interesting to experiment with.
What a beautiful idea for DIY wedding decor! Looks like floating bubbles all lit up - just imagine how it looks at night. We have LED tea light candles in different colors to match your wedding colors: http://www.flashingblinkylights.com/light-up-products/flickering-led-candles.html