A full set (8 each) of white and red wine goblets. After nearly 20 years of marriage I have put them to very good use
Not that I recommend doing this, but:
The most useful present we received was actually a second hand non-stick square brownie pan with a slide on metal lid, which we received from a sweet old couple that lived on my parents street. It gave us giggles at the time, believe me. However, we soon discovered it was perfect for grilling sliced veggies for fajitas. We just load it up with sliced onions and peppers, season, slide that lid on and stick it right on the grill. We have used it 100s of times, and still used it to this day. Who knew!