Apple
Pumpkin
LMP
Pecan
Coconut Cream
Chocolate Cream
Peanut Butter
Berry (a catch all covering all summer berry pies)
Peach
And, um, yeah...that's probably about it. Sure, anyone who reads this list will be able to think of a couple more, but the common variations get narrow really fast.
I remember complaining, as a kid, about a culinary experiment my mother put in front of me: "Why can't you just make the food that you know we like?" (As an adult, I'm already annoyed with my nine-year-old self. "Just eat it, kid, you might like it." But that's beside the point.)