This chair's shape lends itself perfectly to a modern stripe pattern. To ensure the straightness of each line, use painter's tape on each section before spray-painting. You also can paint freehand, following the line of the weave, if you feel more comfortable. After the stripes dry, you can highlight by brushing on acrylic crafts paint using a lighter value of each stripe's color.
Click here for tips on using painter's tape to achieve perfect stripes.