The oliver + s website has a number of free patterns. The Lazy Days Skirt is a simple and quick project. It's also a good starting point for a basic skirt that can be embellished in any number of ways. I changed the hem a bit on two of the skirts, taking the lazy way out on the teal one and just serged it.
Sara now has a lovely collection of skirts for the summer. I'm tempted to try making one for myself!