Setting the stage for a material combination other companies are very likely to follow, More Thing has chosen a rubber and hard plastic combination for one of its early iPhone 5 cases. Para Duo ($27) is composed of a cloudy silicone case and an "I" shaped, colored polycarbonate plastic frame that come together for protection and support. The hard plastic portion comes in orange, blue, purple, or red. More Thing's website lists a screen protector and…