I came across a great tool that allows you to view your SharePoint site and see the theme colors and the CSS for each and every part of your site.
So you download this application that is really an overlay to IE. Load your website in the address bar and then you are able to click on any part of SharePoint site and the the following:
- CSS Class
- Styles - The associated styles
- HTML code for the part you click on.
Here is a screen shot:
This is very nice tool to use to analyze your SharePoint theme.
You can find this software at the following link: http://www.elumenotion.com/Blog/Lists/Posts/Post.aspx?ID=4
Hope this helps,