Making striped and plaid papers is really easy! In this first part of the tutorial I'm going to show you how to use the shape tool to make a simple stripe pattern. (text and photos follow video)
To make stripes I use either the line tool or the rectangle tool depending on how exact I want to be. With the line tool you can specify how wide the stripe will be. With the rectangle tool, you can just draw until it looks good.
Now there's a little breathing room for the end stripes. I'm going to go ahead and crop the canvas to a square. This isn't necessary, but I like to save my stripe patterns for easy reuse later, so this makes them nice to look at.