I have been working on some interesting neon light type of design using a specialized filter on Illustrator and working it further using the pen tool. I started working with the fantasy landscape scene I created and turned into pixel art you may have seen here.
I have created two versions below. One of which has some sky texture or white fills thrown in so it is not a pure neon design:
After inserting the image into my iPad and running some color filters and having to fix some artifacts, this is the image I came up with as well:
Here is the pdf file for the last Illustrator-based version in pure vector format but without layer or editing capability.