So I've been thinking realistically about this (unusual for me, I know), and have concluded that there is absolutely no way that I will be able to finish all the tiles; my schedule is just too full. A liberal estimate would leave us with all the terrain and characters done by the start of next school year. I really don't want this to die, so I think that I should just forget about making shiny new scenery tiles and just focus on making the terrain and characters look really good. We should revert to Silver's old style for the scenery. I can go through and fix things like shading and color use, but we should keep the very simple style. That will cut down on my work load tremendously (also, I like making terrain a lot more than making scenery) and contribute to the clean cartoony style. Silver, I can emulate your style if necessary for new scenery but it would of course be preferable if you could do it.
Let me know what you think...