Select a damask pattern stencil or create your own pattern and have a stencil custom cut. Stencils are usually made from polyester film of various thicknesses, depending on how flexible and durable they need to be for a particular project. The pattern may be a single medallion that stands alone or a continuous pattern that requires relocating the same stencil multiple times so that each block connects with others on all sides to cover the entire surface with the design.
Prepare the background. This may be cake icing, paper, fabric (including needlepoint canvas) or any other surface you want to damask. Paint or dye it the color you want it to be and allow it to dry.
Apply the stencil to the surface and secure it with painter's tape. This special tape will not damage a painted surface when it is pulled off.
Apply the second color or texture over the stencil. Use a stencil brush or airbrush with paint, an airbrush with food coloring or a small trowel with plaster. Allow this layer to dry.
Remove the stencil carefully, move it to a new location and repeat the process until the desired effect is created.