One of my clients just introduced me to a new twist on the traditional unity candle / unity sand ceremony. Are you looking for something different? How about unity glass? You send off for glass and "mix" it during your ceremony. Then after, you send it back to the company and they turn it into a beautiful sculpture for you. Sounds intriguing, right? You may want to check it out :-) Here is a link to their website (where I also snagged the picture below, btw).