As convenient as e-books may be, lending them to friends is a headache; copyright woes notwithstanding, it's simply hard to show what you have on offer. Vodafone Romania just made things a bit easier, though. Its new Digital Library Wallpaper gives you real-world (if very flat) bookshelves to showcase your digital wares. As the library owner, you order a custom adhesive wallpaper that reflects the free e-books you've chosen at Vodafone's website. Once the print is on display, visitors to your home just have to scan QR codes to borrow titles and start reading.