Also one of the 'assorted brushes' (well two infact) are spiky stars (there are also standard shape star brushes too. You can use these brushes to paint a star and then add a lighting effect to it.
Other things to play with are filter>neon glow and filter>diffuse glow.
Also on artwork (above layers on the right side of the screen), the little icon before the text icon adds effects to a whole layer when you choose 'layer styles'. There are inner and outer glows..some freaky neon ones too, that are fun to play with.
Have fun Tasha!