Mixing and matching patterns is a big thing this season. It was prevalent in Alexander Mcqueen's Spring 2010 RTW show as well as Marc by Marc Jacob's Spring 2010 RTW show. Most of the spring fashion shows had this trend. Its young and fun. By mixing random patterns you can utilize the clothing in your closet in many different ways. There's really no way to get this trend wrong, unless you make a total fool of yourself on purpose. All it is, is wearing bright patterns.