Recently, I made Banana Pumpkin Oatmeal Cookies, and I also had home made Pumpkin Pie Ice Cream in the freezer. They were a perfect match and together they made a nice small dessert. Just enough sweetness to be satisfying after a meal, and since they're into individual servings, they've got instant portion control.
And since they're a little fancier than a plate of cookies or a scoop of ice cream, they'd make a nice dessert for guests as well. Maybe roll the edges of the ice cream in some chopped nuts or colored sprinkles, if you want a little extra garnish.
You can make them right before serving, or make them ahead and freeze them. The cookies are pretty solid right out of the freezer, but they soften up pretty quickly. Just take them out of the freezer a minute or two before serving.
It's a darned simple idea, but not one that I think of that often, even when I have both items on hand. And if you made extra cookies and don't want them sitting around, why not make ice cream cookie sandwiches, wrap 'em, freeze 'em, and when you have guests you can bring out a quick little home made snack with no effort at all.