Look again at the pile of photos you just received from San Francisco-based Webshots.com. Sure they’re all yours? The Web photofinishing site is promoting HBO’s new show, Big Love, by slipping in run-of-the-mill shots of the characters (played by Bill Paxton and Chloe Sevigny, among others) among your pile of pics. Folks assume they received someone else’s photos until they notice the promotional flyer for the show at the end of the pile. Big Love, a program about a man with three wives, aired its premiere episode last Sunday on the Movie Network.