Bottom right corner of the browser is small Page Icon - right click > Check Mark On the 2+2 vBulletin Dark Skin, should take care of it. I also think you want Verdant (i like fixed width). I will go to my profile and check the base 2+2 theme that YBB's dark one needs.
I also got some sick Greasemonkey scripts you would like. Feel free to AIM/MSN me.
BRB
Verdant - under 2+2 Control Panel Options
Here are all the GM scripts I use right now.