Using Blender to make a faux watercolour

This is mostly for my own future reference because I have already half forgotten how I did it, and I assume a moderate knowledge of shaders and the compositor. That said you could do a lot of this in a regular image editor, the main technique is just using paint textures from textures.com as masks for blurring and colour variation.

Image descriptions are sparse but I've tried to cover all the important concepts in the text.
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