Call me lame but my favorite ants are fungus growing ants. The great thing about them is their ability to grow and farm their own food. Game play wise, it wouldn't be an infinite supply it would have a food cost to grow a new fungus on each tile but it would produce more than was put in and there'd have to be something in place to prevent growing fungus using the food from the fungus. Also fungus tiles would have to be expensive to keep the levels balanced. I don't know, I just know my favorite thing is watching ants farming. Some other ants will herd things like aphids and farm the honeydew they poop out. I love watching that too.