Decorate cake. Use fondant roller with orange guide rings to roll out yellow fondant 1/8 in. thick. Cut out large triangle and attach to side of 8 in. cake. Attach fondant sprinkles with dots of icing. Use tip 3 and white icing to pipe random dots. Use 9 in. fondant roller with purple guide rings to individually roll out green, magenta, orange, yellow and purple fondant. Use small wheel of fondant trimmer to cut 2 in. triangles: two in yellow, two in green, three in magenta, one in orange and two in purple. Cut out 1 ½ in. triangles: three in yellow, four in green, three in magenta, two in orange and two in purple. Use large end of tip 12 and small end of tips 12 and 2A to cut out yellow dots. Attach fondant triangles and dots to 10 in. cake with dots of icing.