The new Olivero theme has an alpha release, so I decided to try it out here. It's a nice modern theme built on CSS grid. It's the work of a number of my co-workers at Lullabot and others in the Drupal community, and it's intended to become a Drupal 9 core theme.
I think it's beautiful. The only alteration I made was to use my own font in my subtheme.
Read more about it on the Lullabot web site.