I loved the original so much that I couldn't leave it alone. This remix has more pointy things for grip. I tested this for several hours and loved the positive grip! There are two stl files. One with flat tops and another with points that could shred your skin. (I'm using the shred version) You can adjust the grip yourself by cutting off the top or stopping the print short.
I used carpet tape to attach, but only because that is all I had handy. If it comes off, I'll try a more aggressive exterior mounting tape. I also didn't do a very good job of trimming the white carpet tape for the pics.
To gen this, all I did is drop cones on the original using Slic3r and then save the stl file. As a result, the cones aren't perfectly placed ... but hey ... we are just talking about a stomp pad!