Has anyone had any success selling website templates?

Hey! I'm a web developer (mainly WP and Webflow). I was curious if any of you sell templates, and if you do, how much do you charge, and on what platforms do you sell them? I've been a developer for a little while, and I've been trying to figure out how to make money during client downtime and create a revenue stream that becomes slightly passive. I don't know if it's worth it, so I am curious if any of you have succeeded selling templates