Shibaful, designed by Ag Ltd., is an iPhone case that reproduces the look and texture of lawn. The grass is based on Yoyogi Park in Tokyo, with two other international versions, New York's Central Park and London's Hyde Park, in the pipeline. The initial run is limited to 100 handmade cases and they will go on sale in Japan from the end of April for 3,980 yen ($40.68 US).