Another green drink . . .
I'd never heard of Greenies either, so I can't improve on Launderess's recipe (would like to try it though!). There is another green drink I like a lot however: the Green Hornet. It is 1 part green Creme de Menthe to 2 parts Gin. Very easy to make, a beautiful iridescent green color, and a very minty taste. Not recommended if you don't like mint but worth a try if you do.