Decide on your design and the dimensions between the lines.
Tape vertical lines 12" apart. Use a level or measure in 3 spots to make sure you are taping a straight line.
Measure 7" down from the ceiling on every other line and mark with a pencil.
Continue to measure 7" down from the mark or ceiling.
Create a diagonal line from each 7" mark. Repeat until design is complete.
Press the tape on with fingernails, old credit cards or clean foam roller.
Use a color of your choice and a small foam roller to paint at least 2 coats of paint. Use a paint brush to trim out the edges of the wall.
Once the paint is dry, pull the tape off the wall starting with the diagonal lines.
Continue untill all the tape is off. Touch up the paint as needed.