A couple I married over the weekend had a "Glass Ceremony" as part of their wedding. I'd never done a glass ceremony before and was unsure how to approach it. They told me it was basically like a sand ceremony... but cooler!
Here's the scoop - there's a place called Unity in Glass in Lubbock, Texas. You can pick a glass item from their web site and customize the colors. They send you two vials of glass bits, which you combine mid-ceremony into a third container(with some lovely working from moi, of course). You send the combined glass back to them and they melt it down and make a lovely glass keepsake for you.
Contact Sarah and "Let's Do It" Vows for more information about her officiant / celebrant services for opposite and same-sex weddings, commitment ceremonies, and vow renewals in Austin, Central Texas, and West Texas.