[jhanschoo]

Default GNOME theming has been quite atrocious (to me), but I've been using Arc-Dark with Papirus icons and Noto Sans fonts (usually already packaged in Debian-based distributions). I couldn't be more satisfied, and they play well with Nord (from Arctic Ice Studio) color themes.

[tupputuppu]

One of the most important design principles is consistency. Unfortunately that's an objective which is difficult for open source to fulfill. It would be great if the desktop environments themselves took the task of providing a couple of unified themes out of the box, where the colors, icons, fonts and everything else fit together.