Make the main color black, otherwise the blue will just look out of place with your current color scheme.
There are alot more variations, those just what I think seem to go with the current color scheme you have.
As for customization, if you read about the Neo-Crusaders and the Mandalorian Supercommandos, those two Mando sects seems to have a semi uniform approch to there armor. Although they could customize them, the Supercommando's armor all seemd to be the same or reminicent of each other, at least in the chest area. FYI, the Boba and Jango armor are both Supercommando armor types.
And just wandering, are you gearing this towards a specific type of Mando? A sniper, infantry, spec ops, ect? Just curious