We often get comments that Tryton is not eye-candy. This is based on a quick looking at the demo web client.
The rules for sao was to use the minimal CSS (not the theme) in order to use as custom.css any Bootstrap theme.
I think we could add to the demo one nice theme to give a better first impression. We could use one from https://bootswatch.com/3/
Please test the theme on sao before voting, the preview is not enough to decide
If you know other theme we should test, please put it in comment.