Coudal Partners might be the first agency that’s proud to have lost all its clients. Not lost, exactly—purged. The seven-person studio, led by Jim Coudal, got rid of its paying clients (whose capriciousness was always a looming threat) to develop its own businesses. Chief among them are Field Notes, exquisitely crafted memo books inspired by ornate pocket ledgers of yore, and The Deck, an online ad network for design, Web and creative types.