Fabric is bonded on the top of the felt to the left. On the right, cotton is bonded on the bottom of the felt, and snippets of fabric are bonded on top with a layer of net to hold them securely
I couldn't resist trying the plaited faggotting. Needs some practise, but it is a lovely stitch!
More complexity could be added to the counterchange example with either a layer of transparent fabric or a layer of suface stitching as shown at the bottom of the page. This layer overlaps the adjoining quadrants. Could be interesting!