Yeah an entire map was a bit too much. It's better to do something smaller that people can put greater detail into than do something huge sloppily. I thought something like Pixel Art would be great to have as a theme. People could make whatever they wanted and it wouldn't take that long to complete. If you make the topics too specific people are less likely to enter, give a bit of freedom.
But yeah the general idea of MSOTM is good and I think it should stay.