What flavor icing would you put on a lemon cake?

Lemon flavored icing would be good and so would good ol vanilla flavored. I take it that you are looking for a combination that will WOW the comsumers (of the cake of course) You can try orange flavored or.... I know (this may sound crazy, how about rum or tequila flavored ) you know the whole margharita thingee or daquari.

Maybe orange or lime, a citrusy cake.