Alrighty, just created a ViolentMonkey script (should work for TamperMonkey and GreaseMonkey I guess). I don't know about other userscript add-ons, but once you open this link with ViolentMonkey loaded it will prompt you to install it.
The theme is rather basic and it's really difficult to select proper elements on this forum as many don't have proper classnames/ids, but if you find anything odd/missing just post it, I may find a way to apply a style to it.
It's late here so I just slammed all into a single stylesheet and it's all dirty but it should be better if I divide it by pages, but I really need to get some sleep.
Keep in mind that I'm not a designer and I just slammed on what I thought would look good. If someone would create new images too it would be great.
Auto-updating is also there.
The overall grey color scheme looks dope but it is a bit hard to distinguish the unread posts from the read ones, the blue color of the text is too powerful too I think