Roll out white fondant 1/8 in. thick. Cut a 26 x 1/2 in. wide strip. Attach around edge of hat using damp brush; trim ends as needed.
Cut skull using cutter from set. Using pattern, cut out facial features. Attach skull to hat. For bones, cut 2 strips, 3 x 1/4 in. Attach 1; cut 2nd in half diagonally and attach on sides of 1st bone. Roll 8 balls, 1/4 in. diameter; attach to bone ends. Use alphabet cutters to cut out name; attach.