Audrey, Louise Trotter , at http://www.louisetrotter.com, has given workshops internationally and helped many people learn useful bass patterns. Of her many publications, at least four have pages of examples showing the type of patterns you asked about. In First Steps to Harp Improvisation, including recording, see pages 2 and 3. In Easy Fake Book for Lever Harp (pub. by Lyon and Healy) see page 4. In Getting Started in Pop Harp, page 11 and others throughout. In The Creative Folk Harpist, Arranging and Performing, page 14 and many more throughout the book. Browse and pick one or several, and if Louise offers a workshop near you, try to attend; you’ll come away a better player, I promise!