We've used a similar corner shelving unit to create space in a small 7 by 9 ft room. It's a great, easy shelving solution for small spaces (although installing it was a bit tricky as the walls weren't plumb.
Floating bookshelves, these are bookshelves I like. Looks like you could do this with an IKEA kitchen wall cabinet minus door and turned horizontal to mount. IDEA for narrow wall next to our kitchen wall
IKEA Hack: DIY Command Center with Storage and Chalkboard. It started as 3 Expedit shelving units from IKEA but when turned on its side, it offers a great storage and organization center that makes a perfect command station