Melt chocolate chips and shortening in a double boiler over low heat; stir until smooth. To make each mouse, hold a cherry by the stem and dip into melted chocolate mixture. Set on wax paper; press a chocolate drop onto opposite side of cherry from stem. For ears, insert 2 almond slices between cherry and chocolate drop. If desired, pipe 2 white icing dots with red icing centers for eyes. Cover; keep refrigerated. Makes 2 dozen.