I wish there was a skin preset that was like the equivalent of "no skin" but in dark. The default "No skin" is pretty nice for a bright look, and I find the available dark skins to not be equally good. Cyborg is a little too dark (main column) and it can get tiring. Darkly and Slate are better in this regard, but I usually have the sidebars expanded and the color contrast to the main column is significant, and they are brighter, which I find distracting. I made a quick mockup combining Cyborg's sidebars with Darkly's main column (apparently these are the same color):

I know the default "no skin" has a different color for sidebars and main column, but the difference is much smaller since they are both pretty bright. Also, the sidebars are darker than the main column, whereas in every Dark skin it's the opposite - I'd like to see a dark skin where the sidebars are the same as the center or slightly darker. Essentially, keeping the same design choices as "No skin", just darker - not inverting the logic. Hope this makes sense =)