I used the Happy Happenings stamp set on one (the name in itself is just amazing!) and the You're So Sweet stamp set on the other. The Bakers Box thinlits set comes with the aperture you can see above as well as the ribbon holes, handles and other decorative dies.
I've used Bermuda Bay and Melon Mambo on the "Just for You" box and Elegant Eggplant & Island Indigo (plus perfect plum) on the "Happily Hitched" box.
Also, just as an idea - as most people prefer monetary wedding gifts these days - a friend of mine gave me a box like this with shredded paper in and put the money in. Far more imaginative than money in the card and looked gorgeous.
Baker's Box Thinlits £30
Happy Happenings Stamp Set CLEAR £18 WOOD £25
You're so Sweet Stamp Set CLEAR £17 WOOD £24
Bundles containing thinlits and You're so Sweet stamp set (save money)
CLEAR £45 WOOD £51