I’m working on enabling visual tabs customization. The idea is to use powerful XAML for it. For example, to change tabs font family and font size the following style can be used:
Tabs Studio Style Settings
The result is:
Default tabs style
Custom tabs style
Validation box checks for errors in markup. For example, if we enter invalid value 12ptx instead of 12pt, the following error is displayed:
Style validation error
The next step is to allow individual elements customization. For example, a shadow effect for extensions or a font color for the selected tab.
Tabs Studio Blog (organizing Visual Studio document tabs) 