Just my two cents but,
DON'T do cool whip free. It is made with aspartame and you save NOTHING in carbs.
Cool whip has 2 carbs of sugar per 2tbsp and Cool whip free has 3 carbs per 2 tbsp. NO savings there.
Truly, if you want something like that, do it yourself. Make some really whipping cream into whipped cream and use splenda or stevia. You will still be dealing with fat but, a healthier fat than that in cool whip and you can control how much "sweet" and carbs you add.
As for fruit, again, I wouldn't. It could be hard to stop. If you decide that is your best choice stick with raspberry, strawberry, blackberries, or blueberries. They are lowest on the carbs and glycemic index.
I like the idea of treating yourself with something other than food. This is a short term experience and chance to retrain habits. Society teaches us to celebrate with food. It doesn't have to be that way and, for some of us, it is good to learn how to celebrate in a food free fashion.
If you want to try an on plan dessert, try making the IP Icecream. You get 2 servings per recipe. You could have a portion of that with an IP chocolate muffin and call it good.
Best wishes for whatever you decide and have a very happy birthday.
