We have just finished creating the colour variations for the NutsMail 4 desktop themes and you can browse them on our beta site. When NutsMail 4 is released, it will probably contain 24 themes in all (4 desktop themes x 4 colour combinations each, plus 2 mobile themes x 4 colour combinations).
In the future, besides creating new themes, we’re also planning to expand the colour range of our current themes. We’d like each theme to come in 8 or more colour variations, which will give our users more choice and make it possible to get a truly personalized email experience.
Stay tuned, NutsMail 4 will be released soon!