hmmm...
Overall, I'd say you need to work a bit on your subjects, but I'm guessing you were more playing with the methods than anything, which is fine.
#3 in post #4 was probably the most interesting and had the most potential.
They all suffer from the same general problems, but fret not... this is how you learn, right? So, here are some quick tips....
1. Always use a tripod if you can, or set camera up on something solid if desperate.
2. Err on the side of overexposure and then tone it down in post processing. It will look wrong to you on the screen on the camera, but trust me- if you expose it the way it looks to you when you're there, you won't have enough data to make a good image.
3. Shoot in raw. Always shoot in raw. ALWAYS shoot in raw. You need the leeway that raw will give you to get colors and exposure correct.
4. This is the ultimate "paint with light" experience. Look for things that look really neat or would look really neat when the light gets to play. Try to visualize what happens to light where you are looking if you captured it all for 30 seconds.

5. Always use manual focus in the dark and try to focus to infinity on longer off shots. Best bet every time for sharp images.
Keep at it!