You can make your own! There is a book called The Natural Paint Decorator published by Kyle Cathie which has a recipe with quark

9oz quark
2 tbsp natural pigment from art supply shop


this will cover 4 square metres.

Mix pigment with water to make a smooth running paste, adding a little vodka if it does not mix easily, and leave overnight. Add quark stir then add water and add quickly to walls. It needs to dry quickly.