If you have been over to my Facebook page, you'll see that I'm working on pieces that make use of what I'm calling "extreme layering". I build up layers of collage (using Utrecht Matte Medium), and also layers of Sandable Hard Gesso, sometimes mixed with paint, and then sand down the layers with an orbital sander. I use a lot of other techniques as well, but this sanding offers such great surprises!
The above are all 14"x11" on Blick's Bristol. I think wood panel would be a good substrate too, but if you begin with a layer of gesso and then about four layers of collage, this bristsol is sturdy enough. I am using a lot of magazine papers as well as painted and printed papers. I have the benefit - thanks to those of you participating in my collage challenge! - of SO many different collage papers.
When I have explored this process sufficiently, I'll do a workshop on it.