I got this idea from TeachKidsArt, and actually do my own version of this in the fall with leaves. But, this was a fun idea for springtime. It was also a great way to show my 2nd grade kiddos the color wheel and get talking about warm and cool colors. They really "got" it. Once they made one in cool or warm, they wanted to do the opposite, too. I figured it would be nice to display the two next to one another for the halls.