Though Bluetrek's new series of LostDog iPhone 4 Slim Hardcases ($27) are on the surface relatively simple plastic shells, they're distinguished by their rear graphics: each carries one of the upbeat, sentimental messages of French artist Aurele, referencing what he calls "the state of emergency in which our world finds itself and the absolute need to react." Unusually, the LostDog cases not only provide access to all ports and controls, but have…
