I have a bunch of planks. I also have a limited amount of storage space in my house. So ...
It'd be nice if I could build bookcases in my house to hold things. I know I have a trophy shelf and a 4x4 cabinet; it'd be nice to be able to add to my storage capacity there. As it is, my house is getting kind of messy from all the musicblocks and whatnot lying on the ground.
Ideas around this: A "carpentry" skill, with multiple levels of proficiency (whittler, woodworker, carpenter, cabinetmaker). Tool vendors selling nails, hammers. A challenge where I have to collect X sheets of paper, so the rock can then draw up the necessary blueprints. If an "auction house" ever gets set up, a way for me to sell / trade for a bookcase or cabinet.