Architectural magazines are filled with designs. Dover books also provide royalty free art and patterns to use. The internet is also a source for patterns and design. You can take art elements and combine them to create your own personal pattern or design for your home walls.
After you have created your art pattern, purchase an 8.5" x 11" sheet of folder-weight oak tag and a brush. Paint one side with linseed oil as a sealant.
If your design is a copy off the computer or a photo copy from a book or
even something you have drawn, turn the design over on the backside and rub a soft lead pencil all over the back. This is creating a graphite backing.
When you lay your design on the folded-weight oak tag, draw right over the lines of your design. The graphite on the back will allow your line to be transfered on the surface.
Draw about a 6" segment of your design and cut it out with an X-Acto knife.
Hold the stencil flat against the wall. Keep the linseed oil side face you and not the wall. You can paint or sponge your paint into the open area of your design. As you move to the next spot align your edge of the stencil with the end of the painted pattern and continue.