Why not give a metallic back to the case similar to the phones material, but on the inside of the case where the phone is inserted, it has a thin rubber coat to make sure the metals don't scrape against each other or some breathable material so if the device heats up, the case can dispell the heat safely then just rubber absorbing it. Have the same and more color options that the M8 came with.
Keep the front the same as the HTC Dot View case.
Issue is, I cant find a site that could do my idea, and I lack the skills to make such a case. I know it would add slightly more bulk, but I would personally prefer metal over plastic. Anyone know where I could do it?