Well, the dark theme is a bit, shall we say, chocolate-y, and the funky theme is a horrific 80’s headfuck (if slightly amusing), but hey, CSS is CSS so you can change that. The default theme is perfectly tasteful. More importantly it’s lightweight, fast and extensible. I should add it to this blog sometime.
[edit 2016-07] I use Crayon for wordpress these days, but Prism is still a great highlighter for adding to your own build [/edit]