I used Duchess Potatoes as an inspiration for something else this year, go see my Duchess Potato Christmas Trees over at The Kitchn. p.s. I discovered that if you keep baking them they turn a lovelier shade of golden brown. I pulled them out of my oven a bit too early fearing they would burn.
This past Thanksgiving I piped Duchess Potatoes into the shape of bowls to hold a bit of gravy.