Paint the closet interior. Particularly if the wall has been scuffed and marred by years of use, giving the space a fresh coat of paint can spruce it up. To make your angled-ceiling closet look less cramped than it is, select a light color to coat the walls.
Install a hanging bar using a bracket intended for placement on an angle if you intend to use the closet for clothing storage. These brackets are L-shaped and have a hole at the bending point through which you can run a screw to attach your rod. The brackets also have holes on both sides so they can be secured to the wall with screws. Select a spot just above eye level to hang your rod. Before committing to this installation spot, ensure it is deep enough into the closet that the rack can accommodate hanging clothes. Because a hanger extends from a rod approximately 6 inches, your rack should rest at least 6 inches from the door so the door can shut when hangers rest on the rod. Use a premade rod and brackets to make this addition. Use stud finder to locate studs into which to screw your brackets.
Mount shelving on the wall at the back of the closet if you intend to use it for storage of items best stored on shelves. Purchase and install shelves from a mountable shelving kit, or install metal shelving brackets and plywood shelves. Install as many shelves as you can comfortably fit on the wall at the back of the closet, screwing the brackets into studs to ensure your shelves are sturdy.
Place collapsible canvas baskets on the top shelf. Use these baskets to hold odds and ends that would not stay properly placed on shelves. These baskets allow you to make use of space that otherwise would be lost as a result of the slanted ceiling.