My wife says: Life's too short for sugar-free and fat-free foods.
She makes the berry thing that Mr Pedlar was talking about but serves it on her home-made custard, which involves many egg yolks, some half and half, and butter. It's served in a dish with a defibrillator close by.
Yum.
I am with your wife. Life is too short for healthy desserts. I say, eat as healthy as you can for your square meals, and let dessert be dessert. Sorry, OP.
That said, some of the fruit + cream ideas here sound pretty tasty.
You could start playing around with whole grain flours, subbing up to half whole wheat flour for the white flour, so that your dessert has something nutritious in there somewhere. I like this apple cake recipe, which is so moist it doesn't need icing. It's kind of autumny but you can serve it with ice cream (or nonfat frozen yogurt

) to make it more summery.
2 c. all-purpose flour (or 1 c. each all-purpose and whole wheat flour)
1 Tbsp. baking powder
1 tsp. cinnamon
1/2 tsp. allspice
1/4 tsp. ground ginger
1/4 tsp. salt
1 c. packed light brown sugar
8 Tbsp. butter, softened
2 large eggs, at room temp.
1/2 c. applesauce
1 tsp. grated lemon zest
2 Granny Smith apples, peeled, cored, and diced (about 2 cups)
1/2 c. dried fruit (cranberries or raisins are good)
Whisk together flour, baking powder, spices, and salt in medium bowl. In another larger bowl, cream brown sugar and butter together until light and fluffy (3-5 minutes). Beat in the eggs until incorporated, then beat in applesauce and lemon zest. Whisk the flour mixture into the wet mixture til no streaks of flour remain. Stir in apple pieces and dried fruit. Pour into a greased 8" square baking pan and bake at 325 degrees for 1 hour - 1 hour 15 minutes, until a toothpick inserted in center comes out with a few crumbs attached. Let cake cool in pan on a wire rack for about 2 hours before serving.
Also very good: berry "dessert soup"
Serves 6 generously (when I
quartered the recipe it made plenty for four!)
1 pint fresh blueberries
1 pint fresh raspberries
2 pints fresh strawberries, hulled
1 c. orange juice
1 c. lime or lemon sorbet
4 c. plain whole or low-fat yogurt
Blend orange juice, berries, and sorbet. Transfer to a freezer-safe container and stir in the yogurt. Freeze for about 1 hour. Remove and stir vigorously to break ice on top. If it's too thin, leave in the freezer until desired consistency is reached (it's best partly frozen, partly liquid).