Anyone have a good recipe for a white frosting that tastes good? Client is very specific on having white frosting. Thanks!

Indi Debi's recipe on CC is very good and easy to decorate with.

Has anyone ever added frosting whitener to frosting made with butter? If that works you can make any frosting you like white. I prefer creamcheese frosting but most of my friends/family/clientele seem to prefer Indebi or Sugarshack. Both are white if you use all shortening.