"Red and blue factions" Topic

Just painting up some Vikings. I have the first batch just about done (4 units for a Lion Rampant warband). Second warband primed and ready to paint.

Since I may want them to face off against each other, I plan to use different base colors. The first warband is based on red and the second will be blue.

While it planning this, I noticed that I used the same two color red/blue for my Samurai warbands.

What colors do you use in a similar situation?

I'm considering purple and green.

Identify pop-culture reference for No Prize.

Only on Drazi homeworld, Human!

I haven't done quite that. I spray painted small magnets different colors (black, white, red, yellow, blue, green, orange and purple) and I can stick them to the metal fender washers my Vikings are mounted on. They were originally set up for convention games using Pig Wars so I could have six factions. I came to the convention to be told they had let in two extra people, necessitating a quick trip to the hardware store for the orange and purple paint.

Not a color thing, but I recently found myself separating my Gauls into the two traditional high school PE factions, shirts and skins, for a game.

Grelber

Usually red and blue. White and black sometimes. But since it's mostly horse & musket, light units run to green, gray or brown.

Dark brown, light brown, grey, maroon, blue, dark green, and light green mostly. These are modern to far future troops.

I have quite a few medieval European miniatures, but none are painted as coherent units.

I have cavemen with dark hair and blonde.

I think red and blue are great choices.

I've also considered using yellow and white as the factional/national identifiers, because then the miniatures can be painted in any color scheme, and only the decorative stuff will be themed (lettering, numbering, insignia, sigils, stripes, unit badges, etc.).

For my galley collection, I went with red and not-red, because I needed 4 variations on each theme to distinguish divisions at a glance:
Red side
Bright red
Dark red (maroon)
Orange
Burnt umber (reddish brown)

Not-red side
Light blue
Teal
Olive green
Yellow ochre

For my OGRE/GEV colledction I went with one side green-themed, the other side brown-themed. That has caused some odd limitations (e.g., I can't have green/brown camo on anything), and I wouldn't choose those base colors as themes again, but I've made it work.

My Samurai are red and blue but if I do another army, I'll likely do green or yellow. The rest of my armies are actual livery however it appeared.

Could use the color wheel.
Pick a color and then use the opposite wheel color.
Red/green, Blue/orange, yellow/purple.

For my Boxer Rebellion/Chinese Civil War units I have a few that are in mostly white with different coloured pants/sashes – I have yellow, red and blue units – not that I use them much against each other, but it helps to keep track of them in those swirling melees

For my various Dark Ages warbands (for SAGA), I started by using the soil colours to edge bases – so one group had dark brown, another used the highlight colour (light tan) and another the vegetation colour (green).

This works – but only so far. I've been collecting too many warbands and I'm running out of "earthy" colours which are clearly distinct from each other. If I build more factions then I might have to start using bright, non-natural colours such as red, yellow, white…