Vertex paint from particle position?

[mariusandre]

You can use a tySelect modifier to convert selections into vertex colors, and then use your flow particles to do the selection using tySelect's particle selection mode. Finally, turn on additive selections so that the history of selections is maintained over time (ie, the particles will leave a selection "trail" over time).

Then in  your material you can blend with a Vertex Color map.

Awesome!!  Thanks for getting back to me. I'll give it a go.

How did this work out for you?
I cant get my particles to paint into the vertex map it seems...
I copied the plane on which particles are generated and assignd tyselect, selected "assign to vertex color", put it into particle mode and selected the tyflow but nothing happens...
I would be grateful for any help!

I know this reply is late, but I figured it out (kinda). 
For me, I was unable to pick the tyFlow as a particle source.
First I had to export the particles in tyFlow. Then I created a tyCache with those particles. I used that as a particle source instead.

Make sure to check "Assign to vertex colors" and "Additive selections ENABLED" with "Auto update" if not already.

(Also for some reason, I can't see the material effect in viewport. Only in render)

Hope this helps