I spent a couple of evenings reorganizing our bookshelves at home to be colour coordinated and organized by genre. Apparently so did crazedadman (read that one more time craze dad man). Not only did he organize his own shelves, he then thought to get his wife and a ton of volunteers involved in making this stop-motion video of animated books.
Lovely.
UPDATE:
Mark has directed me to another awesome site of photos of incredible bookshelves: http://bookshelfporn.com/tagged/unique