The most important tip to create great bokeh is open your lens to the fastest aperture. The faster your lens the better the bokeh you can achieve.
Fast prime lenses inherently have a shallow depth of field resulting in photos with blurry backgrounds. This is due to the larger aperture of the optics (i.e. f1.2, f1.8, etc.). For a more dramatic blurring effect, choose a lens with a greater focal length. See this example from Olympus Visionary Peter Baumgarten of the various bokeh effects possible with the new M.Zuiko ED 45mm F1.2 PRO lens when taken using different aperture values.