In a microwave-safe dish, place white baking chocolate. Melt in microwave on high, stirring occasionally, until melted. Place 2 pretzel sticks into peanut butter filling of each sandwich cookie. Break remaining pretzels in half and stick next to longer pretzels in each cookie to form antlers. Dip 1 side of each blue, green or brown M&M Mini in melted chocolate and place two on each cookie to form eyes. Dip 1 side of each red M&M Mini in chocolate and place on each cookie for the nose. For a nice gift, place cookies in a decorative tin lined with tissue paper.