That's really a cute idea for a shower! I had never heard of it. At first, I thought you meant the shower lasted around the clock lol.
What about a picnic basket filled with napkins, utensils, wine etc. (and maybe a pretty blanket for a picnic), appointment book, gift certificates for lunch at the bride-to-be's favorite restaurant, assorted gourmet teas, gift certificate for a facial, manicure or pedicure.