Hi, Glenn. Tenderfoot isolation feet work superbly under Well Tempered Turntables and look very nice (nicer than the squash balls, imo). Here's a copy/paste about them from elsewhere on AudioCircle:
"Herbies Tall Soft Tenderfeet work as well if not better than the stock squash balls, without problems with the table maintaining level due to the unequal wear on the squash balls. I've also used Herbie's Turntable footers as well, but I actually think the Tenderfeet might be a touch better in my setup, which needs isolation from footfalls."--posted by watercourse on Jan 26, 2014.
I you wish to go a different aesthetic route, there's no need to develop a new product. Extra-Thick grungebuster Dots are featured on our website in 40mm diameter. X-Large Fat Dots and Giant Fat Dots are also available 40mm diameter (to order, just choose either one and mention in the "comments" section of the order form that you want 40mm diameter). Grungebuster Dots and Fat Dots can be stacked in any combination to achieve custom heights.
Herbie's Audio Lab