You might as well utilise the area under your staircase — maximise the area and make it look good!
Constructing much-needed storage space under the stairs will maximise the area and hide everything neatly. Retrieving items will also be easier. Take a leaf out of Artistroom's book — as pictured above, the tiered storage levels organise small and large items, while the slide-out function saves you the trouble of sticking your head in to look for stuff.
Raumplus sliding doors and interior systems from The Ewins Home can also be customised to fit the area under a sloped ceiling. Made with aluminium components, the doors come in either glass or laminate. You can even customise the design motif for the glass option, so that it blends in with the aesthetics of your house!