Actually, I rather like the "idea" of bench cookies. There are a few sets of them in my shop and as they are damaged, they will be replaced. Peachtree has something similar that is larger and are interlocking via dovetails. I mainly use these for router work and therefore appreciate the additional traction offered by that design. There is also the sheet material that helps one get improved traction, but there are two problems with it for some (not all) applications: First, there is no clearance under it for the bit's overbite and Second, those little holes can quickly fill with dust and render the fabric useless. Both methods have their places, IMHO; and it's up to us to know both systems and use what works best for our particular project at hand.
There are many ways someone could build their own bench cookies - and they could even be something really nice, but to me and the others in my shop those "storebought" models offer a very nice combination of safety, uniformity, convenience and economy. There will always be a place in my shop for these.
OPG3 Tweak everything!