Use the colored pencil on the rough side of the sheets, and use sharpie or permanent marker on the smooth side. Some shrinky dinks come pre-cut and with designs already outlined on them, and others will just be the plastic sheets.
[header] How to make shrinky dinks [title] Draw, trace or copy an image onto a shrinky dinks plastic sheet. [step] Shrinky dinks are usually sold as 8-inch by 10-inch plastic sheets. [substeps] Use colored pencils, markers, and ink on shrinky dinks.