This is one I've been waiting to make for a long time. I was excited when I found rock candy. This turned out pretty good, it was really colorful, and I could taste the flavor from the candy in the champagne. It also fizzed up a bit, that was pretty cool.
This idea comes from The Daily Sugar.
-champagne (any kind will work)
The longer I let the rock candy sit in the champagne, the more of the flavor I could taste in the drink and more of the color the champagne turned.