The only things I really want in the game are sewing and jewellery making (as separate skills, thank you), but I certainly wouldn't mind any of the other stuff mentioned in this thread either. I also kind of wish cleaning was a skill, like in TS2, and that handiness wouldn't span both woodworking and repairing/upgrading household objects, because it's silly to imagine that carving wooden figurines and furniture would make you an expert at repairing broken electronics.
Do we even have any decent wedding dresses in the game? This is one area where I can see a sewing skill come in handy, another would be a potential fashion design career. Jewellery making is something I want because I find the selection we have in the game severely lacking. And how cool would it be if someone who is good at both could actually combine those skills and sew jewels in dresses, for example?