We already knew the modular nature of the CMF Phone 1 and that it will get replaceable back covers, but today we get to see four of the available back colors - black, blue, light green and orange. There may be more in the future, but the handset will likely launch with these first.
CMF Phone 1 back covers
We've seen some attempts in the past with the Motorola Moto X (2nd Gen) and its replaceable bamboo...
http://dlvr.it/T9CB2X