AD Impastoshop is a real time tick painting machine that enables instant Gesso, Canvas, Carve and Varnish Surfaces to your Photoshop brush strokes. It includes a set of special Layer Styles, Textures and more than 70 Pro Brushes that works with the pressure-sensitive capabilities of your pen tablet.
Impastoshop adds some turpentine smell to your digital art universe!
http://alexdukal.com/store/downloads/ad-impastoshop/

These samples were created only using a couple of Impastoshop special layers + the Impastoshop brushes.