I added one banana (mashed it in the mix after I had added the egg), added some chopped walnuts and a dash of cinnamon with the flour. Because of the added sweetness and moisture of the banana, I reduced the sugar to a scant half cup (if I remember correctly) and reduced the milk to 1/4 cup. They turned out well.
We're nearing the end of the blueberry harvest but the squash is bearing in earnest. I picked these this morning.
Hope you're enjoying the summer produce.