Color wash faux paint technique

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Has anyone done a color wash faux paint technique?
I want to try it, and would love some words of wisdom from someone who has done it.

I've researched it online, watched a video about it, and read about it... but it's always best to talk to someone with practical experience if possible.

We painted the family room walls a khaki sand color, and are installing a wood floor, so there's not much POP there... then having bought solid color furniture, we decided we needed to give a bit more visual interest to the walls. We plan to put a blue second coat, with a lighter color 3rd coat on the khaki. My inspiration for the colors came from another recent purchase... which I set on the loveseat for this photo to get an idea of the color combo I'm going for.

blue dove.jpg
Any advice would be greatly appreciated!