I thought this was a neat technique I found on Split Coast Stampers. This is a great site for ideas.
On vellum, stamp your image with white craft ink. [use an outline image] Sprinkle with Crystal Clear embossing powder and heat to emboss. Turn your vellum over to the back [non embossed side] and color in your image with your Stampin' Write Markers. When done turn your image back to the front [embossed image face up] and adhere to your cardstock to complete the rest of your card.