Making Paint Pigment Colour and Dyes from Nature?

Help please. I've recently seen how to make my own paint from cornflour and water, using natural clay from a bank for colour pigmentation and applying it to the walls using a circular rotating action with the hands. Fascinating!

I would now like to learn about what colours I can use from leaves, bark, flowers, vegetables, seaweed, and aquatic plants, etc. Most sites I look at suggest buying pigments, but there has to be someone skilled and knowledgable in the use of natural materials.
I see plenty of examples to dye fabric, but it's for their use in wall paint that interests me. The more diverse the colour range the better. Thank you very much.

By Good neighbour