That's great Llamageddon. We always need more maps and mapping is probably the one part of the game that is the most flexible, which means you are pretty much OK to go with whatever takes your fancy.
My personal feeling is that the game currently has a lot of rural and contemporary (early 21st century) maps. It could use more maps that might reflect strategic locations for aliens: energy production (oil and gas production; power plants; wind and sun farms); political hubs (the UN of the future; political offices); and places with larger populations (cities or things found in cities, like larger buildings).
Also, I think it would be good to try and give some of the maps a little bit of a taste of the future. We shouldn't go crazy with flying cars and robot doormen, but a lot of our maps like +africa, +oriental and +village still reflect specific conditions of the late 20th century that are likely to change somewhat in the next 80 years.
But as I said , you are free to do pretty much whatever you want. And the best motivation to complete a mapping project is to be really excited by your idea, so by all means stick to what you're really interested in. We do need a proper desert RMA.