If you are in need of storage or bookshelves, consider using standard kitchen cabinets.
A client and I have been working to organize her craft space. I arrived one day to see two kitchen cabinets along a half-wall. The cabinets have doors to help conceal the items being stored and match the aesthetic of the room. The plan is to add a simple top to the piece to create a flat surface and use the cabinets for extra storage as well as a credenza.
The cabinets are a great depth for large books and binders while still remaining narrow. And as I mentioned before, the wall we wanted to utilize is a half-wall so it was important to find an organizing solution that wasn't too tall.
What a great use of an item in an unconventional fashion! This is a great way to recycle cabinets from an old kitchen - they can be painted to fit any décor. I am no contractor, but I would recommend mounting the cabinets to the wall to prevent them from tipping.
What other items in your home could be repurposed?