Adding texture to a collage using modeling paste

I had a general idea of elements when I began my current collage project, but it was hazy, so the piece keeps evolving in front of me in unexpected ways. I decided to add some texture to the piece and wanted to blog about it. I have a favorite modeling paste, Lascaux Modeling Paste A. It's thick but very smooth, like pudding. I applied a think layer of modeling pasted on the area I wanted to texture, using blue tape in areas where I didn't wanted any residue. Then I used a foam stamp picked up at a hobby store and stamped away in the wet paste.

After drying, this is what it looked like:

And here's a section where I spread the modeling paste over a color before stamping. Bonus!

For the result in the top pic, I painted a layer of Golden Quinacridone Gold Fluid Acrylics over the dried modeling paste and then Burnt Umber Golden Acrylics, making handy use of a paper towel until I reached the color I wanted.