Your friends will know it is margarita-flavored even if it's not green. First, you'll tell them it is. Then, they'll taste it for themselves. See? Problem solved.*
*The aforementioned anecdote is simply for educational purposes and bears little or no resemblance to the actual occurrences of my kitchen tonight around, say, 10:43 pm.
**OK, that's a total lie. But in my defense, nothing about this "recipe" has gone according to plan, and I can't be held responsible for my actions. I mean, the graham cracker crust (the first one - the one I threw out) - shrank! Can they even do that?