While the actual cereal itself does not change color, the Christmas-themed Rice Krispies Treats typically involve adding food coloring to the melted marshmallow mixture to create festive colors. Common Christmas colors used for Rice Krispies Treats include red and green, which are associated with the holiday season. The treats might be shaped into various holiday-themed designs, like wreaths or Christmas trees, and decorated with colored candies or sprinkles to enhance the festive appearance. However, the colors are not inherent to the cereal itself but are part of the creative presentation for Christmas.