These are the cake icing laws, right?
red velvet or carrot cake = cream cheese icing
yellow cake = choc buttercream recipe from the back of Hershey’s cocoa. I did make a caramel frosting to go with a scratch yellow cake which was good, and I’d make again (the cake recipe didn’t have much taste and was too dry and crumbly
chocolate cake = depends on the recipe, if it’s my grandmother’s choc sheet cake I make the chocolate icing that goes with it, otherwise, vanilla buttercream from the back of the confectioner’s sugar box