I'm not sure what category these go in.. star structures?
They're fixed tripod shots with my Sony DSCP100, 15s exposures. I tried to get the reflection of the stars off the lake. There were too many weeds in the lake for the effect I was after, but it kinda worked.
The first one is Orion, the second and third are Taurus and the Pleiades and the 3rd also has Mars at the top of frame.
Curves adjusted and resized in Photoshop, final noise removal in NeatImage.