When it comes to bookshelves, wallpaper is the ace up Elizabeth Hay's sleeve. "We love to wallpaper the back of a bookcase," says Hay, who used the tactic for these built-ins. "It's a great thing ...

The idea: use a bookshelf wallpaper on your iPhone, with app icons scattered around the various shelves. There are a variety of different bookshelf designs already out there. Most that we found ...