We found using limeade concentrate for frozen margaritas to be a great time-saver over squeezing fresh limes. Blue curaçao is an orange-flavored liqueur that's tinted blue.
Makes about 5 cups
1 (6-oz.) can frozen limeade concentrate, thawed
3/4 cup tequila
1/4 cup blue curaçao liqueur
Combine all ingredients in a blender. Fill with ice to 5-cup level, and process until mixture is smooth. Serve immediately.