Lately I've been working with a gouache palette I made up last fall, which was inspired by the cover on one of my husband's tech books. (Inspiration is where you find it!)
With nine colors, I had lot of room to play. I really had fun using other media with my palette too. Copic markers in colors that toned well created layers and visual interest.
I love palettes with close tones, but this presented a challenge when cleaning up my scanned images in Photoshop. When choosing my next palette to work with, I'll keep that in mind.