About a month ago I replaced the theme of this site. Over the course of the past two weeks I have taken that a step further and greatly enhanced the base Zen theme for Hugo. I have named the result the DFD-Zen theme (for Hugo).
It has quite a few extra features (not yet documented) and I think it looks better. Of course the author of the Zen theme for Hugo does advise that the Zen theme is a base theme not a complete theme.
In any case, I am happy with the result, and I hope you are as well.