Garage storage - use a pallet! Pick one up behind a store, bolt into beams, and done! 15 minute project for organization! - finally, a project for pallets that won't bring nasty toxins inside my house.
Staircases take up a lot of space, so why not use them for storage as well. Imagine each step is a box with a hidden drawer in it still allowing for additional storage or home office space beneath the staircase.