Vellum Overlay Cards Video by Jennifer McGuire Ink. I created my cards with my favorite heavyweight vellum and adhered the mini stamped card inside. After applying anti-static tool to the front, I heat embossed the outline image of the flower and leaves in white… directly on top of the images underneath. When heat embossing on vellum, I let the heat gun get very hot before bringing it to the vellum. This prevents warping.