Does DS like coconut?
http://www.splendidtable.org/recipes/dinner-grounds-coconut-cake
The photo at the link does not match the actual recipe at all.
I've made the yellow cake at the link and it is very good. I frosted it with a White Mountain Cream frosting (an egg white frosting as you are toying with using). It is a lovely frosting.
While cake and frosting were each delicious, the overall experience was fairly bland. Next time I will be looking for higher contrast in flavor and texture for the frosting.