I never know what to get either for weddings, but one thing I've done for many people I know getting married (and with great success) is to by a reasonably sized plastic storage bin, Rubbermaid or something, and fill it with cleaning supplies, toilet cleaner, laundry detergent, pine sol, paper towels, sponges, etc. and usually a pack of M&M's for the bride. Not sure if that would be appropriate or not but the ones I've made have gone over really well.