Lilla a design has the most adorable way to turn a milk carton into a play boat for a stuffed animal or small doll toy Using an empty carton and paint.
Good for ages 6 and up.
Get the instructions here:
http://lilla-a-design.blogspot.com/2010/03/skepp-ohoj.html
Get the instructions here:
http://easypreschoolcraft.blogspot.com/2014/02/recycled-milk-carton-boat-craft.html