I am totally happy with Grav and am using it for almost a dozen domains already.
I ususally like to stick with the default theme (at the moment "Quark") and try to achieve everything I want without changing the theme.
The downside of this approach is - obviously - that all sites do look very similar. I am trying to tweak this and that with inline HTML and some simple twig stuff, but I wondered, whether people tweak the default theme to achieve interesting layouts and effects.
Some of you might remember the site "CSS Zen Garden", where people showed off, what they achieved by just styling the plain HTML - i wish such a source of inspiration would exist for Grav.
Don't get me wrong: There are plenty of interesting themes - but it is a bit cumbersome to test them in order to see, how my site would look like (not mentioning the adjustments, you might need to make, in order to make it work).
As I am writing, this brings me to an idea for the future: Wouldn't it be cool, if certain effects, stylings, layouts etc (controllable by markdown or other simple means) would be available as plugins? 🤔
Anyway: If you have had cool ideas of how to twea the default theme "inline", please feel free to share your outcome! 😉