I wouldn't do pizza or icecream. The icecream will make you hold water from the dairy and flatten/smooth you out. And you might bloat like crazy from the added sodium and grease from the pizza.
Try sf jello and sf pop sicles, lettuce, raw veggies. ice chips even though they are not filling. sf gum if you can have that.
Its very normal to crave stuff when dieting. That is why it is important to incorparate a cheat meal into your dieting preps. With me it is aways a baked goodies with sugar and I fill right back out, with others it is something totally different.
Do you know how the last week of the dieting will be?