Seeing how the current wristbands are so high in demand, Theory11 doubled the point value to acquire them (which I also is due to a means to prevent the current stock from going to zero while awaiting the next shipment to arrive).
I don't see a color variant happening anytime soon. The only thing I would think is feasible is the same black silicone band but with the logo in some shade of blue.
If anything, a better idea would be to make a completely different wristband--maybe one that incorporates some sort of magic effect.
A metal wristband? Complete with drummer and backup vocals!