Place half the vanilla wafers in bolw of food processor fitted with knife blade. Process to fine crumbs. Remove crumbs and reserve. Repeat with remaining wafers. Add pretzels (about 1 cup) to food processor and process to fine crumbs to make 1/2 cup crumbs. In large bowl, combine wafer crumbs, pretzel crumbs, powdered sugar, margarita concentrate and cream cheese. Add tequila and Triple Sec, if desired. Stir until well blended. Divide mixture in half. Wrap each half tightly in plastic wrap and set aside. Combine half the grated lime with decorator sugar and half with granulated sugar on small saucers or in small bowls, stirring to distribute lime peel evenly. Remove plastic wrap from 1 portion of the dough and shape into small 1" balls. After shaping each ball, roll each in green or white sugar. Work quickly, because the treats dry quickly. Repeat until all dough is used. Stor in an airtight container in refrigerator up to 1 week. Makes about 7 dozen.