I blogged recently about looking for some cool bookends for the shelf in our spare room. 
I was hoping for something industrial, and, as usual, something inexpensive. I figured I'd make it myself.
Not the case though - I found the perfect solution this weekend at a garage sale for tools. I bought two old (although I wouldn't necessarily call them antique or vintage) c-clamps for $2 each. That's exactly the price range I was shooting for.
I snapped them up before Rob could get to them first (he feels very protective about clamps and was emphatic that I could not use his antique clamps he inherited from his grandpa for this particular project). I wasn't able to find a pair of the same size at the garage sale, but I figured that would be OK.
I just tightened them around the shelf where I wanted them. Rob helped me, and as he did, he remarked that one was crooked. That made me feel even less guilty about using them for my books, rather than contributing them Rob's workshop downstairs.
What do you think? I like them, although I'm thinking about shifting them to one end or another so I have room to add something else up there.
Also shown in this picture: the tin I spray-painted glossy black, wire baskets I bought at an estate sale  and the retro radio Rob and I turned into an iPod dock.  Also, if you look carefully on the bottom right, you'll see a basket full of cup pulls I bought at a great price for some future kitchen remodel. I didn't want to run any risk of them rusting (or me losing them) so they're in the spare room instead of the basement.