Glad you like them. I tried several different things from my original maps, and I think they came out very nice.
I spent quite awhile trying different palettes I came across on the net. Some of them are considerably different from others. I ended up using a slightly tweaked version of the NTSC one found on Wikipedia.
One thing I like is that I included enemies that are parts of the stage, like the snake-shooters in Snake Man's level. I always thought my original maps looked too empty there. I also included the turret things in Needle Man's stage, and several mini-bosses I had previously left out.
I did take a slight artistic liberty in Magnet Man's stage. I wanted to show it before Proto Man blows up the little section, but it didn't look good if I used the following screen as-is. So, I replaced 8 tiles to make it work:
marioman - If you're referring to Zero 2, it's not going to happen. It was just an experiment, and I never even played the game past a couple of stages. I like the classic series much better.
Jon - No front page exposure? :-(