There was a guy around here who at Christmas has a kiosk filled with band saw boxes in fanciful shapes. Butterflies, lady bugs, stars, crazy eight shapes, small stands with multiple drawers. Painted, and unpainted but with nice finishes. Small, portable and if not too childish, will be kept forever.
Have your wife pick up some appropriate gold pins or ear rings to put inside them as a double surprise. Maybe with their birthstones. That will be appreciated for a long time.
The more I do, the less I accomplish.