As played out as the whole one-piece hard plastic iPhone 4 rear shell category has become over the past few months, there are occasionally new releases that stand out from the pack, and Bangkok/Berlin-based Bling My Thing has one of them. The company's Simple is Beautiful series of iPhone 4 cases (€30-€45) are clear or semi-transparent rear and side shells with Swarovski Crystals attached, varying in patterns, coloration, and mirror finishing.…