One set that I've been working on collecting is the Clothbound Classics set by Penguin. They're simple and beautiful, and I think they make a statement grouped together. I have to admit, I stalk Amazon to see when there are more books being released in the set. I think I have two or three pre-ordered as I type this.
I actually have them all over the house. Most of them, as pictured below, are in our main living room mixed in with the Big guy's collection of decanters and some other fun mementos from trips we've taken.
I also keep some on our mantle. I rotate these depending on the time of year. Right now, it's all the blue ones since I'm going for a wintry feel. I've done black/gray/scary books at Halloween, brown/beige at Thanksgiving, and usually keep ones with magenta accents up all year round.
I also have a few sets that I keep in our guest room. The first is the series of 5 Virginia Woolf books that I love for the dust covers. Normally I don't keep dust covers, but I made an exception for these.
There's another set that I've picked up for the dust cover designs, and those are the F. Scott Fitzgerald books. I love the art-deco flair on these designs. Not surprising, they heavily influenced the vibe I have overall on our guest room.
What about you? Are there any books that you've picked up, or maybe even hunted down, because of their design or because they were part of a series?