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Maybe Make it so in the grey areas when you touch the phone the heat from your hands changes color! It would be awesome. I can create a model if required. Although I wouldn’t know the material. But I don’t really know whats allowed and what isn’t and idk if you guys will hate it or not. I’ve always wanted to participate in a community phone design. But hope you can use my idea and hope you like it. good luck on your ideas guys!