I stayed with Adam Parra’s pale grey and black design, asuming it is a new design replacing a traditional blue one. Trim is red for Engineering and Tactical, Blue for Science and Comms, but I switched to gold for command and used black for ONI (on sleeves or to replace the grey upper body). I freely confess to using the colours a little imprecisely in trim deliberately to make each avatar more distinctive. I have tried to use extremes of height and build and beardiness for the same reason.
One day with a bit more patience and practice I will assemble a bigger group shot. My biggest problem is in cleanly outlining each figure to cut them out.