Print your favorite gem art from the internet, or from this post (it's at the very bottom of the page) - or create your own, then trace onto a piece of freezer paper. Cut out with a craft knife to create a stencil and iron it waxy side down onto the front of your shirt to create a temporary bond. Cover any exposed areas of your shirt with more freezer paper or paper towels to protect from potential overspray. Lightly spray a coat of Emerald Shimmer over the stencil openings and let dry, then spray a second coat. Continue spraying light coats versus one heavy coat to help prevent color bleed. When you are happy with your color coverage, let dry and remove the stencil.