I'm genuinely curious.
FH and I aren't really sentimental, so I can't really imagine doing a unity ceremony or displaying any sort of sand or candle type thing in our house afterward.
Maybe we just haven't seen anything that's really spoken to us, but I feel like the whole point of a wedding ceremony is already about unity with lots of other traditions symbolizing your commitment to each other---exchanging rings, signing the marriage license, etc.
I'm genuinely curious to hear why other couples decided to do some sort of unity ceremony on top of the other ceremonial traditions though. I'd hate to skip doing something and then regret it later. I'd also like to know what kinds of unity ceremonies are out there, so let me know what you're doing. Maybe it will inspire me to look into one a bit more.