Fanciful Peppermint Fudge

Source: Diana McMillen, Midwest Living

4 cups granulated sugar
2 (5 ounce) cans evaporated milk (1 1/3 cup total)
1 cup butter
1 (12 ounce) package semisweet chocolate pieces (2 cup)
1 (7 ounce) jar Marshmallow Cr