The team colour changes for these sets in PvP are cool! but I would love to be able to choose which colour I want for PvE too (green, red or blue). No choice should be available in PvP though, they would still inherit either blue/red.
Also I think this could make the PvP sets more appealing to non PvP players who just enjoy vanity, at 10,500 EP for Destiny Set I think HCS might sell more of them if they allowed the option of colour change as we kinda get 3 sets in 1!