So since I'm not admin yet, I can't get access to the theme designer to easily change the colours and background of this website. However, you are able to have your own personal CSS files that modifies the Wikia look for yourself only. Probably not such a high priority thing but I did it anyway and got some custom CSS.
If you would like to try it for yourself, go to User:Jonius7/common.css and copy the source code there. Then go to Special:MyPage/common.css open in classic editor or source mode and paste and publish. Press Ctrl + F5 or Shift + F5 to refresh your browser cache.
You will now be able to browse the Wika using my CSS! I hope you like the colour scheme of yellow, orange and a bit of Red and grey.
EDIT: I copied the CSS from a fresh new Wiki custom to the colour scheme, seems I wasted a lot of time manually adding parts of my own. Oh well. It's still not complete though as Wikia dynamically generates CSS according to the page content.