Vitor Balbio shares a subdued, professional looking Blender theme.
Vitor Balbio writes:
Graph is my first try to make a cool and professional UI Theme for Blender. It's a complete rewrite of Blender Theme and Startup file (Workspaces) and is designed for Blender 2.7x releases. It's inspired by many works of the UI mockup thread and feedback from Blenderartist users.
Hope you like it, suggestions and feedback for new versions are welcome!