I was experimenting with, what I would call pure color paintings--where the intent is to place paint color at very similar values, and then use a little bit of value (maybe) to finish the painting.
This is a challenge (i.e., hard) if you're an impatient watercolor painter like me. I end up with numerous bleeds, and mixing because I don't wait for the paint to dry, and I don't always have the color values quite right.
Anyways, here are three paintings that use identical palettes of four paints. Quinacridone orange, carbazole violet, manganese blue hue, and undersea green, all from Daniel Smith. The first, (at the bottom) I was randomly placing paint.
The second, since I liked the colors, I was thinking about tit a bit more (the photo is a little too dark).
And, the last I used gray to turn them into a landscape. I may try something else with this combination of colors since it makes lovely grays.