An elegant light theme for xfce, based on Yaru Blue Light, contains xfwm4, xfce-notify4, gtk2+3 themes and an icon theme that is mostly based on Yaru (depends on breeze icon theme, so make sure it is installed or change the theme to inherit from your favorite icon theme).
I created this theme on Ubuntu 20.04 (Xfce 4.14), older versions are NOT supported (It might still provide a better user experience and compatibility across applications than most other themes though thanks to the Yaru inheritance).
V 1.1 now additionally contains an icon theme that provides mainly the mimetype and action icons from the Yaru icon theme plus some panel status icons from other themes and some custom ones.
To use it, copy or symlink the folder "mmolch-xfce" inside the "icons" folder to ~/.local/share/icons/ and edit the index.theme file if you want it to inherit from another icon theme than breeze ("breeze-icon-theme" package in Ubuntu repository).
I recommend a panel height of 28 or 30 px and an icon size of 16px with this theme. As font I use Noto Sans Regular @ 9px. Also note that I disabled compositing (Client side decorated windows and menus have round borders otherwise).
Eventually I'll add another archive to the downloads that contains the supplementary stuff like the breeze icon theme and Noto fonts for people who don't have them in their Linux repository if wanted.
Feel free to report issues and feature requests on github.
V 1.2 changes: Added an xhdpi theme for xfwm4. To use it, rename the folder 'xfwm4@xhdpi' to 'xfwm4' after renaming or removing the old folder.