Tint a 3 in. ball of fondant light gray. Roll out and cut a 1 3/4 x 3 1/2 in. seat; attach with icing. Insert 2 lollipop sticks behind seat, 2 in. apart. Cut two 1 1/4 x 2 1/2 in. seat backs; attach with brushstrokes of water, sandwiching sticks in the center. Reserve remaining gray fondant. Ice section behind seat backs smooth. Cover cart with tip 16 stars. Print tip 3 name.