Grind pretzels into fine crumbs.

Melt butter or margarine.

Combine pretzel crumbs and melted butter.

Press the crumb mixture into the bottom and up the sides of two 8-inch pie pans.

Refrigerate the crusts to chill.

Sprinkle unflavored gelatin over 1/4 cup of margarita mix in a microwave-safe container.

Let the gelatin mixture stand for 2 minutes.

Microwave on high power for 40 seconds, then stir thoroughly.

Let the gelatin mixture stand for 2 minutes, or until completely dissolved.

In a large bowl, combine the dissolved gelatin mixture, remaining 3/4 cup margarita mix, sweetened condensed milk, tequila, orange liqueur, and green food coloring.

Blend until smooth.

Divide the filling equally between the chilled crusts.

Chill the pies until firm.

Garnish with lime slices before serving.

Cover and refrigerate any leftovers.