Up to now, Apple peripheral maker Twelve South has offered devices for Macs and iPads, but the company is branching out into iPhone accessories as well with the introduction of BookBook for iPhone, a version of its book-looking case designed specifically for the iPhone 4. It costs $59.99.

[ad#Google Adsense 300×250 in story]BookBook for iPhone resembles a leatherbound book, but it’s actually a pocket-sized wallet that encases and protects your iPhone 4, and offers space for your driver’s license, debit or credit card, cash and receipts.

The BookBook provides edge-to-edge protection, and the leather case has been distressed to give it a worn, aged look like it just came off a dusty library bookshelf. No two are exactly alike, according to Twelve South.