Besides
www.Quiltville.com, there is
www.MaryQuilts.com. They both offer a lot of free patterns to use scraps and strings. There are books galore ready to show you even more scrappy patterns and ideas. Currently I am trying Bonnie Hunter's concept of leaders and enders. There is a good explanation of it on the website. She also has a book under the same title. I was enjoying myself much making those crumb blocks from odd shaped pieces that I had to remind myself I needed to work on a specific project, too.