Seasons would be cool. I wonder if you could do it like, when in IRL it turns summer, in-game it also turns summer. I dunno, just a neat idea.
Not sure about IRL because it'd take so long to change! It'd be cool to see different stages of growth in the terrain though. It seems like a load of work though, you'd have to have a different animation or sprite for each season. The coolest thing about it could be growing plants and harvesting them in the right season. Different plants could produce a range of food with bonuses. For example: A snow-melon would add resistance to cold attacks if you eat it. You plant it in the summer and harvest it at winter. Fireberries increase your fire attacks by +4 damage. You plant them in the winter and harvest them at summer. If you don't harvest them in time they spoil and you have to start over!
