The Rise of the Guardians art book explains that each of them has a representative color and shape. I bought a pack of random shaped tiny boxes, then it occurred to me- these are all the Guardians shapes! (I had to improvise a bit for tooth. There wasn't a diamond.) Each of these boxes is only an inch and a half to two inches wide, painted with acrylics. I included their "centers" inside each box. These will be up for auction as a set at Tekkoshocon.