The cost of Venetian plaster can vary depending on the color and the area of the project. On average, the cost for venetian plaster can start from $5 to $7 per square foot. It is important to consider where you will be getting venetian plaster done and what colors you will want, as getting ceilings done can cost more than walls and getting a red theme can cost more then a white. Some people use Venetian plaster to create a faux finishes, which can make the area look like a shiny marble. With the technique done by Premier Painting Pros, venetian plaster can be used to create a variety of textures and patterns, making the walls a one of one!