I'm also a fan of cream cheese icing on most fruit flavored cakes.
The only thing I do differently than mentioned above is to add an extract and zest from a rind.
For lemon cake, I make cream cheese icing with lemon extract (just a tiny bit or lemon juice) and scrape a tablespoon or so of lemon zest in it. For an orange cake, cream cheese frosting with orange extract and orange zest, etc.
My daughter's favorite is strawberry cake with cream cheese frosting with some smashed frozen strawberries added.
Darn this diet! Now I want cake
