I really like that last one, minus the pole.
As far as the 'starburst' thing goes, yes your aperture will dictate what shape they take. I don't necessarily agree that shooting f11 will give you sharper images though, every lens is different. Its all about trying and error, and knowing your equipment, you play around you'll find the sweet stop. With night stuff, I personally will do everything I can to block out and avoid light coming directly at the lens. Makes exposing a hell of a lot easier.