Little boys do love jumping in mud puddles. My rain quilt is inspired by a lovely children's poem by A.A. Milne, from his anthology "When We were Very Young", called "Happiness" and its first line is, "John had great big waterproof boots on."
My boots are made from a kind of plastic fabric which was left over from the Knights costumes I made for my grandsons. I wanted to put lots more splashes and bubbles on the boots but my free motion foot would not move across the plastic. It just stuck like glue.