This may be controversial but hopefully there is logic in what I'm about to see.
I just took a look at Cologne Blue and there are a huge host of CSS issues. It makes me wonder if anyone is actually maintaining it. All the other skins seems to render nicely. Coordinates overlap the header and the Echo button is overlapping other text. It just looks shoddy [1].
Firstly is anyone actively maintaining it for Wikimedia sites? Secondly, how widely used is it on our production Wikimedia wikis?
I suspect it would be a good idea to at the very least move it into its own extension and possibly disable it on some Wikimedia sites or all Wikimedia sites.
From my personal opinion, the less skins we have to maintain on
Wikimedia sites on the better, and if no one actively cares or uses a skin then it is silly to invest time in doing so...