Liquid starch is a good adhesive, but, since this pattern was developed, Stiffy has hit the market, which would be an excellent alternative ... and, unless you soaked your hard would hold up nicely with a just a lightweight felt or medium weight fabric backing. Stiff would also give you great versatality in using a slightly larger doily and shaping the edges different ways. And, hope about a button or small PomPom on the top, or some beads stitched here and there. I think this idea has a lot of potential.
I've made a copy and set in my stack of things to experiment with. Perhaps you'd like to give it a try as well.
Or, don't have an extra doily to experiment with ... they included a pattern for the simple cobweb design in the above picture.
If you do try this, please stop back by and let me know how it goes.
Thanks for dropping by,