Maybe you can make an angel cake and for the frosting do a fat-free cream cheese frosting mixed with strawberry.
If you go to FoodNetwork.com, Alton Brown (my favorite chef) has a great recipe for homemade angel cake.
Is the 7-minute frosting on this website?
Oh, I didn't think about angel food cake!
Has anyone tried adding a can of diet soda to a cake mix? I heard about this from a friend on WW. How does that taste?
The ff cream cheese frosting sounds pretty good. Would I be able to pipe/decorate with that?
I "think" you could. maybe you could add some fat free coolwhip to thin it out a little bit if it is too thick..just a guess 
You could make a chocolate cake and replace the fat with pumpkin instead. (one chocolate cake mix, 15oz can of pumpkin (not pumpkin pie filling), 1 egg white and 1/4 C water). You can make this with a spice cake too, both are delicious. This is far superior to the diet coke cake your friend told you about.
Seven minute icing and chocolate cake is my family's favorite.
Hope that helps.
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