While doing some research, we came across these nesting cubes at Target. What seems boring and prosaic becomes, like many things, more interesting on a closer examination...
They can line up to become a low dining or coffee table and stack to become a bookshelf. They can also be used as seating. We like their versatility, perfect for a small space, and their price, $69, perfect for a small budget.
Available at Target, through their online store. Looks like they're also offering free shipping.