Venetian plaster is a decorative paint treatment that adds a level of classic sophistication to an interior space. Used in traditional Mediterranean design to add texture to walls and ceilings, it can be difficult and labour-intensive to apply because it requires several layers and skilled technique. To create a marble-like Venetian plaster effect in your space, you can use inexpensive paint and faux treatment tools for a fraction of the price of paying a professional plasterer.
Apply a light base colour to the wall. This colour will peek through your other layers of paint in some areas around the surface of the wall. Use a normal roller, spray or brush technique to create a smooth finish over the wall's surface.
Dab a cloth towel in the second colour of paint and apply liberally in thick patches to the wall. Usually when you paint, you would smooth out pools of paint with a brush or roller. In this case, you want some of the thick texture to stay. Use a small plastic spatula to smooth some areas of the paint, but do not smooth completely. Allow these areas to dry slightly before continuing.
Dip a sponge into a third shade of paint. Generally this colour of paint will be a shade darker than the base colour, but lighter than the second colour. Press the sponge onto the wall surrounding the thick patches of paint. This will help blend the different shades of paint together to create a marble-like effect. The sponge will also create even more texture.
Add any finishing touches of detailed texture and blending with a small paint brush. You can also use steel wool or a trowel to create texture and definition where desired.
Work only in small areas at a time until you are comfortable with the look of each section.
Do not apply the paint in uniform patches. The idea is for the paint to look weathered and textured, not smooth.