the top row doesn't seem to make much sense to me. why did you add one shade that has the same brightness, or even darker as your bluest shade but that doesnt fit in your hue-shifted ramp?
I can't say I really like the lower ones, but I would rather use the colours on a proper picture, since a palette is always supposed to fit the mood of a scene, so it's hard to create a "good" palette without anything it's supposed to fit.