These are all photos, made with my trusty Nikon D70. None of them have been altered in any way, other than reducing their size (they were all 3000 x 2000, I’ve made them 750 x 500).
As you’ve probably guessed, these were made by using long exposures at night, while a friend and I were driving around (don’t worry, I wasn’t the driver). (The very first one was not made at the same time, and no driving was involved, but the method was the same.)
I just found it interesting that you can get some really spectacular imagery by using random methods.