Line tray or cookie sheet with wax paper. Remove wrappers from candy canes. Set aside 12 candy canes; crush remaining 8 candy canes into small pieces. Remove wrappers from chocolate bars; break into pieces.
Place chocolate and shortening in small microwave-safe bowl. Microwave at MEDIUM (50%) 1 minute; stir. If necessary, microwave at MEDIUM an additional 10 seconds; stir until chocolate is melted and smooth.
One at a time, dip about 1/2 of each marshmallow into melted chocolate; shake off excess chocolate. Immediately sprinkle chocolate portion with graham cracker crumbs and dip into crushed candy canes. Place uncoated side on prepared tray. Push candy cane through top of chocolate about halfway into marshmallow. Repeat procedure with remaining marshmallows. Allow chocolate to firm Store in cool, dry place. Makes 12 pops.