NESmaps.com has a wide variety of map-based posters from the NES library of games, including Mega Man 2. You can choose from the maps of the Robot Master stages for $12.50, the Dr. Wily stages for $10, or the whole shebang for $20.
Incidentally, if you don't think the Mega Man 2 maps are what you're looking for, there are plenty of others, including numerous RPG maps. Personally speaking, that Zelda II: The Adventure of Link map looks pretty sweet.
Thanks to Bob Chipman for bringing this to our attention!