The Blue Bottle Tree - Yes, this is polymer clay. I call it Watercolor Agate, and you can get the tutorial here: https://learn.thebluebottletree.com/courses/watercolor-agate-with-polymer- clay/ | Facebook
Look, we need to talk about painting polymer clay - The Blue Bottle Tree
Polymer Clay Tutorial - Where to Sart for Beginners | TREASURIE
Working with Sculpey Soufflé - Part 2 - The Blue Bottle Tree
Polymer Clay Tutorial - Where to Sart for Beginners | TREASURIE