Banana nut muffins are my most favorite...but I also love blueberry muffins and cranberry orange muffins....as for savory muffins, I do have an onion muffin I have made in the past...has been awhile....had forgotten about them until it was mentioned here.
I have a cookbook called "Mad about Muffins" that has lots of great muffin recipes....some in there I have bookmarked that I have made and like are Cinnamon, Strawberry Banana, Parmesan Tomato, Cheddar cheese and Mustard, Oatmeal Sunflower and Lemon Poppyseed.
I could eat muffins every day if they weren't so high in fat.