Alternative pattern in my eyes is anything and everything. You can take inspiration from an unlimited array of sources and transform it into a quirky and conversational, sleek and simple or random and fun patterns. For example, this image here is from a scrap book I made when I travelled America. It captures what I did in a day in San Francisco and went on to inspire both some illustrative and some abstract pattern designs.
Be daring with these designs and you will get a lot of enjoyment from them!