To prepare glasses, rub a lime wedge around the rim of each glass. To coat rims, invert glasses and dip into a shallow dish of coarse salt. Shake off excess salt.
Prepare as above. Pour into a 1-1/2-quart freezer container. Cover and freeze overnight. To serve, use a large spoon to scrape across frozen surface and pile into salt-rimmed glasses and garnish with lime slices.
Designated Driver Margaritas:
In a blender, combine one 12-ounce can frozen limeade concentrate, 1 cup orange juice or tangerine juice blend and 1/2 of a 6-ounce can (1/3 cup) frozen lemonade concentrate. Blend as directed in step 1.
Blue Lagoon Margaritas:
In a blender, combine one 12-ounce can frozen pineapple juice concentrate, 2/3 cup tequila, 2/3 cup blue curacao and 2 tablespoons lime juice. Blend as directed in step 1.
In a blender, combine one 12-ounce can frozen pink lemonade concentrate, 1 cup bottled pomegranate juice, 3/4 cup tequila and 2 tablespoons Cointreau. Blend as directed in step 1.
So Strawberry Margaritas:
Prepare as in step 1, except blend half of the mixture with 1 cup frozen unsweetened strawberries and 2 cups of ice. Repeat with remaining mixture, 1 cup additional strawberries and remaining ice.