I have some white, brown, and black shrinkable plastic that can't be colored with the paints and pencils that I have. I bought a variety pack to see which kind I liked best (the previously mentioned Frosted Rough N'Ready won out) and have been trying out some projects to use all the different kinds. Anyway, I cut out the tree shapes from the plastic and punched a bunch of holes. Then I used some colored buttons for the "ornaments" on the trees. I guess you could use thread but I used colored wire here.