This was great on Strawberry Cake! I believe I originally got this from Recipe Zaar, but I'm not sure. If you want to lower the calories and fat, you can use Cool Whip Lite and reduced fat cream cheese.
1 (12 oz) carton of non-dairy whipped topping, thawed
1 (8 oz) pkg cream cheese, softened
3 Tbsp powdered sugar
Mix all ingredients until blended. Whip well. Spread on your choice of cake.