Make getting clean more fun for all your guests. Buy them each a Bath Time Ultimate Favor Kit (for 1 Guest), which comes with a yellow plastic bucket, tub tint, rubber duck, turtle squirt, bathtub boat and a squishy sea creature. Did you know that the first rubber ducks made in the 1800s didn't even float? But by the 1940s, the bright yellow floating ducks were available. Many are made of vinyl and other material nowadays, but we still call them rubber ducks.