Activity for J&B

Okay, so our tables are round, seating 10 at each. Each table will have an herb name instead of a number, so Table Rosemary, Table Sage, Table Thyme, etc... There will be a potted plant at each table with that herb in it, PROBABLY in a regular pot...

I'm messing around with centerpiece ideas. So far, this is the one I've liked the best, but I feel like I need something inside the wineglass. Obviously, water is not going to work. I was thinking maybe clear vase stones and smalll hidden LED...