In an application (Visual Studio 2010) the tabs of files that are opened in the editor are always brownisch, whatever Windows theme I use. There is a plugin for VS2010 (Visual Studio Color Theme Editor) that supports customization of theme colors, and it works except for tab coloring - anybody an idea? Windows XP.
The Productivity Power Tools for Visual Studio 2010 allow you to color code your tabs by project or regular expressions.
See Tab Well 2010 included in the power tools extensions.