Whatever source you find for free designs, you can best make your own stencils with a double blade cutting knife and flexible plastic. You can always use a stiffer plastic and do a template type design but the double blade makes the slots in the stencil. You might find the double blade knife which is made by Olfa at hobby stores or some quit shops may carry it. The Stencil Co has them as well and the flexible plastic. www.quiltingtencils.com. You can also make stencils with a single blade hobby knife such as Xacto but will have to cut two lines for the slot. A student brought in to class a stencil she made from cutting freezer paper. It worked. I would not recommend the hot burning tool and mylar plastic as the tool is expensive and not eady to work. Tends to puddle up the melted plastic on the back side of the plastic.