Rubber / silicone wristbands (Oakridge RG21)

Left over from a Coldplay tribute concert, I have dozens of these rubber / silicone wristbands to give away. None seem to be lighting up anymore, however originally they lit up during a concert and could change colours. They were all destined for the bin but I rescued them as I'm sure they could have some sort of second life. All are fitted with cell-type batteries, pictured. The wristband straps are made of a soft rubber / silicone material which could be useful for crafty people.