Yeah, you don't have to make another pie... you can make tarts instead... just sayin'.
Muffins sound delicious, but do you have enough for, like, a loaf? A pumpkin loaf? Some sort of delicious sliceable cake that you can top with a delicate sugary glaze (with maple for the win).
Oh, I know the type you mean! I made strawberry bread like that recently.. Come to think of it, the batter was similar in consistency to the pumpkin filling I have now, right down to the added cream cheese. With just a little tailoring it would work very well.
cream together 2 parts cream cheese, 1 part sour creme and 1 part corn starch, then put in your leftover pumpkin pie filling, pour it in a gram cracker pie crust (or even just a deep pan lined with tin foil if you want something a bit different than pie)
or you could mix it into flour (and baking soda) and a pinch of salt till it comes together in a loose dough you could fry up almost like a pancake? you would probably want to add some more fat to that recipe too...