The new theme ( #2 ) - with white logo
The result of #2 (closed) may be previewed there: http://tango-controls.readthedocs.io/en/td-2-new-theme/
Just for comparison, there is also an alternate version - with colourful logo on white background: http://tango-controls.readthedocs.io/en/td-2-new-them-logo-background/