I was hoping to get an idea for personal symbols for Maiko, Sang and KKK.
Well, let's consider some imagery associated with each… symbol could comprise a combination or stand-alone of any of these, or other stuff people come up with…
Jin's Amulet (what does it look like?)
Heart (for compassion)
(Trying to think of something funny he's turned into, and all I can come up with is Sang :p)
Okay, here's my draft image of Maiko's mon. While I'd like a more precise version of it, I know such a version will not come from my hand; I'll just be proud of what I DID do.
And here's the symbolism within it:
At the bottom of the image are three apple leaves, resembling family in a somewhat insulting manner. From them grow cherry blossums, symbolising Maiko's "growth to perfection" by moving away from her heritage; which climb towards the symbol of the storm as she aspires towards the lofty ideals that represent the pinnacle of the Jin warrior.
Not bad, huh? Better than a boring ol' triangle :P
What's wrong with my triangle!?
Erin made a colourful one in Paint… (I kinda just inverted your one then added colour and shiney blossoms.)
Pretty flowers are pretty.
Colour? But, that's not traditional… :P
Still, this means I can now properly make a space marine army with them as badges. :3
And you say that like mine wasn't made in paint :P
"Mon are essentially monotone; the colour does not constitute part of the design and they may be drawn in any colour."
What I interpret that to mean is that the colour of the mon is not important, only the design. Two mons identical in design but different in colour would be considered the same mon. By extension, they could be any garish rainbow mix, because only the design would matter.
It may also be relevant, before we get too wrapped up, to point out that historical accuracy isn't very important, and indeed may be detrimental.
I still prefer it in two-tone; it just feels more credible.
The idea of having a mon with that many different colours is damaging to its purpose; it becomes harder to recognise at a glance with every bit of added complexity. Which means either every single soldier bearing the mon has to have the multicoloured version, which becomes expensive and pointless; or you have a variance in the mons, which can cause confusion.
Ergo, Maiko herself would favour a simpler colour design for practical reasons.
As long as you use some simple rules, like the colours on metals rule in European Heraldry, then it should work out, a lot of late European ones can be very complex. On the other hand, personal choice goes a long way.