When neighboring color wheel hues share the same undertone such as greenish blue gray and sage green two tone walls display a gentle transition without a chair rail partition.
Two tone room colors with chair rail.
If you have high ceilings another example of this two tone technique might be to pair a bright coral with tan this time reversing the theme of light above dark.
When you have a chair rail it can be hard to figure out whether to use the same paint colour on the upper and lower portion of the walls or to do two different colours.
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By putting the bolder color above the molding above the chair.
For example the base color can be applied onto the plain walls while the accent color is applied only onto the cornices wainscoting and trims.
When updating the room for my oldest son we painted above the chair rail a gray and painting white below the chair rail.
Color blocking can also depend on the surface being applied on.
These are two different colors but work well together without allowing the bright hue of pink to overpower the room.
The fourth bedroom has a chair rail with wainscoting under it.