How to Make your CRM Service Appointments pretty colors
1. Enable ISV.Config in your web.config file
2. Modify _Resources/isv.config.xml
3. Modify <Install path>\SM\Gantt\style\GanttControl.css to include your new styles
4. Recycle the CRM AppPool
For point 2.
In isv.config.xml find the <TimeBlock> section.
Add additional sections for your service appointment status codes.
Also: You should trim out the "test" elements included in the isv.config file or you will find some extra menus and buttons showing up.