Use drawer slides; mount the drawer on the wall; attach the shell to the slides, so it pulls out. Shifty Desk / Hallway Stand by Daniel Schofield This is such a great storage idea! It can be a shelf and a drawer.
A space for your secrets. The latest project by Japanese studio Torafu Architects may look like a standard floating shelf, but it actually contains a slim secret drawer that can be opened with magnets.
Wall mounted corner shelf: I like the design and how it attracts the eye, but I picture this made with reclaimed pallet wood doubling or even tripling up planks that would give it more depth and character.