For now, email me. With the exception of the purple one, these designs are etched into clear plexi in reverse and snapped into the top of the "Inset" type premium knob. The design on the purple one is etched directly into the anodize layer, but we probably won't be offering this style right away.
I can also provide a clear, removable cover with no etching if you want to print something yourself and place it in the top pf the spinner knob (or use a photo, etc...)
RandyT