This version of a margarita leans heavier toward the orange side of things than the lime side of things, but still isn't too sweet. Because there are quite a few other ingredients besides the orange juice, the color isn't too different from a normal margarita, but you'll definitely be able to taste the difference. You can adjust the amount of simple syrup to make this sweeter or tarter according to your preference.
3 ounces tequila
2 ounces lime juice
2 ounces orange juice (strain through a fine-mesh strainer)
1/2 ounce orange liqueur
1/2 ounce simple syrup
Combine everything in a cocktail shaker and shake well. Strain into glasses over ice.