Clasped weft is a technique often used in tapestry and "Saori" weaving. This is a good video on the subject. Simpy wrap one weft around another and pull it through. Can be done with 2 or any number of colors. You are only limited by your imagination. If you're not familiar with "Saori" weaving, it's usually done on a 2 shaft loom where the weaver creates free-form (from the heart) designs.