Pour 1/4 to 1/2 inch of red sugar onto a small, shallow plate. Pour 1/4 to 1/2 inch of white sugar onto another small, shallow plate. Moisten the rims of margarita glasses with a wedge of lime, dip the moistened glasses into the red sugar, then the white, alternating sugars so that the edge of the glass looks like stripes on a candy cane; set aside.
Blend tequila, simple syrup, limeade, peppermint schnapps, triple sec, and lemon juice in a blender until smooth. Pour tequila mixture into a quart jar.
Fill blender with ice cubes. Pour 1/4 the tequila mixture over the ice and blend until smooth. Add grenadine for color while the mixture is blending. Pour mixture into prepared margarita glasses, add a splash of orange liqueur, and sprinkle crush candy canes over each margarita. Repeat with remaining tequila mixture and ice cubes.
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