Landscape Legend Lightroom Presets - created specifically for landscapes and nature photos. 100 one-click presets plus extensive collection of workflow presets. This light room tutorial offers lots of help.
This chart shows the effect of aperture on the size of the starbursts. As you can see, the smaller the aperture, the more emphasized the starburst. The same concepts apply during the daytime as they do during the night time.
Starburst effects can add an interesting element to a photograph. In a dark scene, it can add a dreamy, peaceful twinkle to the lights. In a daytime scene, a starburst sun can add drama and interest (Diy Photo Lighting)