I had a bit of an art attack moment while sitting down at work quaffing copious amount of freeze dried coffee, could you use coffee granules as watercolours? You can (And it was surprisingly nice to use). I used just a teaspoon of granules but used boiling water for mixing, it was actually easier to use luke warm before becoming almost impossible with cool water. It was quite difficult to get a nice solid dark colour as it was just too sticky and didn’t look nice. Just a bit of fun trying to use more textures and colours in my illustration.
Also turned it into a monster repeat pattern which you can find here.