You can get a lot of mileage out of using thumb and index finger! Travis picking: named after country-and-western pioneer Merle Travis, it’s a style of fingerpicking characterized by the steady thump of an alternating bass that underscores rhythmic patterns and melodies on the treble strings. Moving the thumb to an adjacent string lets you play more “plectrum-style” as well, so you can certainly make your playing more interesting than either style separately.