Hi there,
Congratulations on your upcoming nuptials!
My friend just got married herself, and had the same idea as you. She gave out the pots, which were stenciled with their names and date, with just the
seeds in a little packet, wrapped with a bow. She chose pansies, which are fast and easy to grow. They did need to be transplanted after a while, but by then the honeymoon was over, hee hee. Anyway, it was a lovely gift and I still have the pot on my windowsill.
That's the only thing I can think of, sorry. Good luck with your decision!