Chris isn't able to change the colours for some reason, but for once he gets it working:
I'd give you line numbers, but the stylesheet has all line feeds stripped out of it (hurr gotta save those 8 bytes!).
, as usual.
blockquote blockquote blockquote
Change the background colour for both of these selectors to #262626 to match the outer most quote box.
PM message background. Change to #282828 to match the background for forum posts.
The mini panel in the user control panel is almost white. Change it to #212121 to match the other items of the sidebar in the user control panel.
Edit: I'd personally make some changes to the colours of certain things as well, like hyperlinks. They're pretty inconsistent right now.
It's all over the place, but if you want a good example, just hover over the link in my post and then over the links in my signature.