"The children of kings grow up too quickly, or not at all."
--Qie Zi, The Art of Seej
Use plaster of Paris and powdered tempera paint to cast your own sidewalk chalk in bloxen form.
Cast models are Seej-legal, subject to Core Rule #2.
Casting tips at: http://www.zheng3.com/2012/10/01/casting-about-for-new-ideas/
No assembly required. Just print and start casting.