When my kids were little I did this with them. We just used (had) the regular muffin circles. the neat thing about putting them is the tin and melting that way is as stated by hopetoquilt, when the kids color with them the color will change as it goes from one crayon to the next. Its a great way to use the broken and worn crayons from the previous school year during the summer-cause they all want a new box of crayons for the first day of school.;-)