My plan is to have a single mech in my Omega Star in such colors while the rest use the standard scheme, an honor that pilot has earned.
On the opposite end of the spectrum, does anyone know of a crime a warrior might commit that would require a temporary mark of great shame, but not justify pulling them from combat duty or transferring to a lesser unit? I've got a Fire Scorpion where I accidentally put the Clan emblem on upside down, and I don't want to redo it. My best idea was that they were the cause of great waste, such as taking part in a Seeker Quest, but through mistake or negligence their actions caused the destruction of the objective artifact.