Create basic plaster designs using a bucket of joint compound, water, whisk and wallpaper brushes. Mix the joint compound and water in a bucket to make the plaster. The plaster should have the consistency of pancake batter, drip slowly but not be runny. Put a scoop of plaster on a piece of cardboard and practice the design you want before putting it on the walls. Use wallpaper brushes to create basic arches or scattered lines in the plaster. After you master the desired look, start working the plaster on the wall in sections.
Use a Venetian plaster to create a marble look on your bathroom walls with the expense of real marble. Real and faux Venetian plasters are available at most home-improvement stores. Faux plaster is less expensive than real Venetian plaster and both come in a variety of colors. Make the plaster according to the package instructions and apply to the bathroom walls. Use the bristles of a brush to make designs in the plaster as you apply it to the walls.
Plaster designs can add special elements to a child’s bedroom. For example, create flower designs into the walls of a girl’s bedroom. Take the non-bristle end of a paintbrush and draw the flowers into the wet plaster before it dries. Plaster can dry in about 20 minutes, so be sure to design small areas at a time. Other designs ideas include squares, circle, bugs and zigzags. You can also use your hands and fingers to create designs in the plaster.
Add color as a design element. Color tints and natural pigments add pizzazz to plain, white plaster. Find color tints and pigments at your local home-improvement store. Add the color to the plaster before applying it to the walls. Use stencils, paintbrushes and plaster tools to create designs in the colored plaster. If you mess up a design, simply smooth it out and start over again. This is why it is important to plaster in small sections at a time. Colored plaster gives a unique look to any bedroom.