The top is Blue Buddha Boutique's Barrel Ride necklace kit, the middle is theor Mini Barrel kit, and the bottom is a variation I made, because I wanted purple in the middle. Everything is AA.
This is a variation of Blue Buddha Boutique's tutorial, in AA and rubber. Usually, the rings connecting the barrels are the same size as the rings in the barrels. Because I wanted 3 complete sections of rainbow, I made the connectors smaller.