I've been off work for the last couple of weeks and have been playing around with theming the site.. I don't like the default skin and I really dislike the dark skin. Like all web-devs, I like when people use something I've made so I'm sharing them. There are quite a lot of changes to the site overall.. Not just colours.
For now, it's just two dark modes. Dark purple and dark blue. I'll add two clear themes later this week, or you can find them in the Feedback "Skins" thread and install them yourself.
The extension is Stylus. I use this extensively all over the internet as other users submit styles for all the big sites. I have dark modes for FB, the Guardian, Google etc. so even if you don't want these themes, I still highly recommend the extension.
How to install: Click the icon and click Find Styles. Look for Dark Blue / Dark Charade
They're not 100% finished yet so feedback is welcome. Bump if you like them so others will see them.