I've used several recipes from the Cake Mix Doctor books that have alcohol in them.
I've used Kahula, vodka, margarita (margarita mix, tequila and triple sec, lime zest), bourbon, beer......my cupcakes are for adults!
I also use the alcohol in the icing too. The kahula and (Guinness) beer worked well in cream cheese icing. The bourbon was good in a chocolate glaze. The margarita was basically a buttercream icing with all the margarita fixings in it.
I've never had any leftovers!
Man cannot live by chocolate alone, But Woman Can!