Here you go Mark, this should get you going in the right direction. I was able to find the css for the default vBulletin color scheme.
http://pberge.com/files
Enter user: jp pass:css when prompted, then download the jp.css file.
Probably the easiest way to figure out what styles need to be changed for specific areas of the page is to use the firebug firefox extension. For anyone that doesn't want to be bothered to install it, there is a great web based utility that will also work in Opera (and IE, but IE has no way of changing styles that I know of, so
).
Go to this page:
http://slayeroffice.com/tools/modi/v2.0/modi_help.html
And bookmark the link that says "bookmark this link..."
Come back to JP's and go to the bookmark you just created. Now hover your mouse over what you want to change and a nice little informational box will pop up on your screen telling you exactly what you need to know.
For example, if I hover over the Reply to Thread header bar I can see it has a class of .tcat. Find that section in the stylesheet and make your changes.
Note: All styles must have !important added in order to override the default styles.
P.S. I spend way too much time developing websites.
