I often get questions about how can a particular web part be branded separately from all the rest or be branded by type. For example you want every Contacts list to have a green header bar instead of a tan header bar. Or perhaps you want a column of web parts on a page to look different than the main area that contains other web parts.
The latter I have always had a solution for, the former I figured out something today. As with everything that I focus on, these are “no custom development” / “no .NET code” solutions. You can usually build whatever customization you need with custom code. If you would like to just rely on CSS however, here you go….