Help with wedding present?

Hi, my husband's friend is getting married in two weeks. They have lived together for years and have a house that's nicely furnished with a big outdoor entertaining area and they have a lovely kitchen. They haven't registered anywhere, so we have no idea what to get them. We thought about gift vouchers to a shop, which is a nice idea, but we'd like to get them something rather than just money or a certificate. They are ages 30 and 33. Does anyone have an idea? I was thinking a nice dinner somewhere maybe, or something to cook with... I don't know the woman's decorating style so I'm unsure about something decorative to sit around the house. Anyway, thanks for any suggestions!