This is what I started with:
I took a 3 day workshop with Sue Pink, a very talented artist who does abstract impressionism paintings. She was very generous in showing us her techniques and helping the class progress, layer by layer until we all had individual paintings we could be pleased with. We worked with watercolors and acrylics on paper. Some of the paintings were done on new white paper, some were old watercolor paintings that were covered over with a mix of gesso, water and matte medium. Abstract G was done in approximately 5 layers. You begin with layers of random colors and lines making imprints as you go. After that dries Sue told us to begin by covering the areas that we like the least with a neutral color and continue doing that. I found that to be a very easy way to start, eliminating things until I got to the point that I liked what was left. You add textures and lines using whatever you have on hand. We used stencils and stamps; manufactured or hand made; watercolor sticks and pencils, there really was no limit. We just let our creativity rule the day. It was great fun and the days were gone in a flash.