I just posted this recipe for Japanese-style mashed potato croquettes. The mash I used was actually a combo of sweet potatoes and white new potatoes!

http://www.food52.com/recipes/15135_mashed_potato_korokke

We've got lots of great ones on FOOD52 -- soups, baked fries, mashes, salads -- here's a favorite: http://www.food52.com/recipes/14515_brown_butterroasted_sweet_potatoes_with_arugula_and_bacon