Icinig for Cocoalight Cake

Hi I just wanted to comment! I have this obessession with recipes/cookbooks. I frequently buy cookbooks from thirst stores etc., so about a year ago I bought: Baking From My Home to Yours by Dorie Greenspan. I didn't really do anything with it until tonight. I was flipping thru and came across an index card (old) with a recipe called Cocoalight Cake. I was like, what in the world is a Cocoalight Cake (while estastic to find this recipe I'm a little sad if someone lost this recipe you can tell it's old I wonder did the owner pass away or did they pass this recipe on and to a relative and they lost it). I googled it and the 1st one I came across was Identical to the typed recipe on the card and it had a Caramel icing. On the back of the index card is a recipe for a frosting using flour, confectioners sugar, butter, salt, vanilla and milk. So after all that my question is what type of icing would you use on this cake?