The look of Folk Art is free flowing, not crisp and clean and surely not precise. Tearing (or freely cutting) the edges of your images or mats, to make them irregular, is the foundation to the Folk Art look.

Hold your paper in front of you and tear toward your body holding the paper with your left hand and tearing at an angle with your right. Tearing from the right to the left gives you more width to the finished torn edge. The more rough the torn edge is, the more primitive it looks. Adding chalk to this torn edge outlines the image and likewise ages it.