When I was playing Gundam Breaker 2, after a while I started using these colors for all my builds.
What can I say, I just liked them.
black on limbs and what looks like upper layers of armor.
grey on the remaining body parts and to break up the black
teal on other small areas, stripes, vents, places that will make it pop
Although i do try other combinations
It always seems to work, no matter what the machine
That was before I even watched Gundam, tho.
It was Decepticon colors to me. I can't think of what black and purple decepticon I may have been thinking of at the time, but I picked those colors for Decepticon reasons.
I never really developed post-Gundam custom colors because the Gundam Battle/Assaut games didn't let you paint your mech.
Don't thing there's an option for it in that game but:
1) Standard unit/army colors; slightly oversized killmarks. Keep adding killmarks until mecha looks like some sort of strange leopard pelted monster.
2) As above but with alternating white and black lines for every kill; repeat until mecha looks like it's wearing dazzle camo.
Fuck yeah, dazzle camo
Straight-up pink. None of that Char crimson-secondary.
Charcoal, light grey, and dark blue.
Shades of brown, with orange-yellow and other neutral colors as accents.
An older one, would probably change some of the green placement if I were to redo it now.
Titans Test Team colors.
They work pretty well on the X3, I just couldn't resist.
White, Gold, and varying shades of Blue.