What is a good housewarming gift to get for a young, traditional couple (see more)?

I only know the girl, we went to grad school and now work together. My husband met her a couple of times and I never met her boyfriend. They just got a new place and we’re becoming closer friends – I’d like to get them a present, nothing expensive..any ideas? They’re in their mid-20s, white, American, traditional (their own term)...