Theming Whiteboard
There are two versions of the whiteboard here. One is small and will download quickly, the other is gigantic (more than 20mb).
I think the issue of theming really boils down to turf. App developers want to theme. Distros want to theme. I think the app developer should just bundle all the theme resources into the app. If they want the app to look a certain way it's up to the app developer. I like the idea of an opt in theming "API" where an app developer may choose to ignore the distro theme.
I've included some screenshots of Notejot and Sequeler which both look good on Pop!_OS despite Pop!_OS not using Adwaita.
Small
Full Size (download)
Edited by Bryan P