Kitchens
Full kitchens, from the island out to the tall cabinets that run all the way to the ceiling. Painted or stained, with the storage worked out around how the room actually gets used: pull-outs, divided drawers, a carousel where the corner would otherwise go dead, a garage for the appliances that live on the counter.
If the boxes are already sound, refacing is an option too. New doors and drawers, the same footprint.