I still don't see it, sorry.
- I put custom icons in Calibre Settings\resources\images and I can see them in Calibre.
- I do ' Create icon theme' pointing to that directory, and get a zip file.
- ???? What do I do with that theme zip file to test it?
Posting it to MR for you to make it available for everyone seems like something that should happen after testing.
Plus I'm not really making a theme--I'm trying to test themed icons for plugins so I know my plugin changes are correct.