My TT has two tall and narrow closets - one for hanging stuff and one that is divided by a shelf. I found the tall "hanging" closet in our TT to be useless, so I added two shelves inside it. That leaves 5 "cubbies"... Myself, mom, son and daughter each get a cubby for clothes, last cubby is for bathroom towels. Shelves are very basic - I used building glue (may have been Liquid Nails) to attach strips of wood to the walls of the closet, then cut plywood to fit and sit on the wood strips. I coated the plywood with a couple layers of polyurethane.
We put plates and some cooking utensils in the camper's oven. We rarely use the oven, so it acts as good storage. Obviously you have to remember to remove anything in the oven before lighting it!