My students learned about warm and cool colors by looking at the art work of Kandinsky.   I first had them divide their paper into six squares.  I had them paint warm colors first, then we painted our squares in cool colors.  I then went over patterns with them and had them make a warm, cool, pattern with their circles.  We used colored construction paper for the circles.  You might want to remind your students to start with the largest circle and make sure they look at the color of their square to create the pattern. So if their square is yellow, which is warm, their 1st circle should be a cool color, and so on.  It gets a little technical however this core relates to math, students should know how to create AB patterns.  Remember be Art Smart and have fun. Enjoy😀🎨