Think Cosmo, but use a silver tequila instead of the vodka. It livens up the taste and balances with the cranberry. If you have some extra money burning a hole in your pocket, try one of the citron flavored tequilas with this for more zip.
2 ounces tequila
1 ounce cranberry juice cocktail
squeeze of lime wedge
Shake ingredients with ice and strain into a cocktail glass.