Decorate cake. Use fondant roller with pink guide rings to roll out reserved white fondant 1/16 in. thick. Use fondant trimmer to cut 84 strips, each 3/4 in. wide x 9 in. long. Make 84 fondant ribbon roses.
Prepare thinned fondant adhesive following recipe directions. Use brush and thinned fondant adhesive to attach ribbon roses to sides of cake beginning at cake base.