I got a GC for a car wash a month as a wedding present and frankly made fun of it when I got at (as a stupid little 24 year old). But I tell you, every month when I went and got my free car wash, I thought of the person that gave me that gift and was thankful. So assuming they have all the normal household items then I would get them an "experience gift".
A popcorn popper (maybe the mickey mouse one?), popcorn, Junior Mints, a Blockbuster GC and some movie ticket GC to a convenient theatre
A GC to Victoria's Secret, a bottle of champagne, temporary tattoos
A GC to Ben and Jerry's, chocolate sauce, whipped cream, marschino cherries (hmmm that sounds naughty after the previous post! Maybe you could combine them!)
A GC to a night at a nice hotel to recoup from the wedding
A Merry Maids (or other housekeeping service) GC
Tickets to a concert for a favorite band/singer/speaker
Any of the "of the month" clubs...fruit of the month, flowers, etc etc