Jo, as you well know about us 'artists' -- most of us have the worst filing systems ever. Here's a picture of one of my 'plant poundings', a summertime JM leaf and little seed thingies, (AKA helicopters).
It's done on dry w/c paper.
I have one of the leaves when they turn bright red and it's really nice, color is more intense than when they are green. I might find it -- probably by accident, in the next year or two. If all else fails, I could walk around to the side of my house and grab a leaf, already red.
It's more controlled than what you are doing, but I thought it might be interesting to add a corner of a leaf or a seed thingy or a real bloom to your free forms and/or negative areas. Also adding a different type of natural 'pigment'/medium.
