I'd have thought things like alcove cabinets/fitted wardrobes would be the main things you'd be asked to do. Though i genuinely have no idea what the bulk of work is for joiners, and unless you're very skilled to make very ornate things i'd have thought making furniture for a competitive price would be difficult.
Only thing i've asked a cabinet maker to make for me was some speaker cabinets, but that was a while back now.