I saw someone using some paints a while ago,
you make your surface of your paper wet within the lines of whatever you are drawing, and you put little 'paint crystals' onto the wet area. They produce a sort of colour run effect, - for instance this woman was painting leaves, and a few crystals gave a kind of watery red/yellow/brown effect - similar to water colour, but the colour is more intense. And the remains of the crystal stay on the surface of the paper giving a textured effect.
Apparently you can get these crystals on the internet, and they can also be used on fabric.
Does anyone have any idea what I am on about, - I've googled paint crystals, but that isn't coming up with what I'm looking for.
Well done if you can understand my description!
TIA