So easy.  Fold toilet paper tubes to make a triangle and square.  Lucky you, the circle is already done. 🙂  Then dip the ends in paint, stamp on paper, and you have a shape masterpiece!  This is a great craft for toddlers who haven’t mastered painting with a brush.  You can talk about shapes and colors while you create.

You might want to give them one color at a time or else this happens…