In the dining room? IKEA makes affordable Vittsjo shelving units, and if you spray paint them with Rust-Oleum’s yellow gloss paint, you’ll get a similar look to the colorful metal bookshelves at Room and Board.
Small Space Secrets: Swap Your Bookcases for Wall Mounted Shelving. Here's a creative shelving arrangement that uses a deeper shelf at bottom to create a sort of bench. The bench can serve as extra seating for parties, or as a display space.