A palette topic, fun!
Now, I typically have no idea what I'm doing when it comes to pixel art, so it's going to be a bit harder to justify my decisions in coming up with my messes of palettes... But I still do enjoy dealing with them, even if they don't make much sense.
So, here are the ones I've dealt with to date...
The palette I was using for Nothing, after several revisions. The game was to be set entirely during night, so there's a lot of blues and purples. Overall it wasn't too useful, and I ended up using very little of the palette.
An attempt to come up with some more interesting colors for an art style I ended up being incapable of handling. This palette kinda ended up being all over the place, and I barely ended up using at all; used in JiroSum, and nothing more.
I ended up thinking this one through a bit more than the others. This one was made specifically for Illuminator, in such a way that any color I'd use would have an easy ramp towards dark blue, which served as darkness in the game. Y'know, since the whole game was based off of light and darkness, and it would be doing a lot of transparency blending during runtime. It worked well enough.
My latest attempt at an all-purpose palette, made specifically to try to keep me from relying on "safe" colors. Admittedly, I didn't have much of a plan when making all those gradients, and a lot of space is now wasted on "useless" colors... But I've at least gotten something out of it, so it's served its purpose well enough.
EDIT: Oh wait, was this supposed to be more "art"-type palettes? I went and posted my game-based ones instead. I hope that's alright.