Oh my goodness this place is the coolest! Stumbled across it while in Lawrenceville ("Candle Lab, what's that? Do you think there's tons of candles I can smell??") and was thrilled to find out I can mix my own candle scent!!!!
Basically you smell a ton of scents (maybe 100+), pick your faves and combine 2-3 with the ratio you want to make your own candle. You also pick which container you'd prefer, which is how price is determined. It takes maybe 20-40 mins to smell everything and mix your scent, depending on how much time you spend among the scents, and then you come back at least an hour and a half later to pick it up once it's ready. My only issue with this place is that prices are a bit steep, but it is a really cute activity that I didn't mind splurging on too much.
Pro tip: baked bread (my fave scent) and hot cocoa make for a brownie/chocolate croissant type deal