In advance: Make bow and streamers. Tint 8 oz. fondant green; add 1 teaspoon Gum-Tex. Roll out 1/8 in. thick. Cut 2 strips for loops, 2 1/2 in. wide x 8 in. long. Brush ends with damp brush and press together. Cut ends to taper to 11/2 in. Align on sides on cornstarch-dusted board, supporting openings with tissue. For streamers, cut 2 strips 3/4 x 10 in.; cut v-shaped notch in ends. Shape and let dry on cornstarch-dusted board, supporting with tissue. Cut a 3/4 x 2 in. strip for knot; wrap around ends of loops.
Make hook. Tint 3 oz. fondant blue. Roll a 1/2 x 10 in. long log; shape into a hook and let dry on cornstarch-dusted board.
Tint remaining fondant: 18 oz. violet, 5 oz. yellow.
Roll out yellow and remaining violet fondant 1/8 in. thick. Use wide end of tip 1A to cut approximately 12 violet circles; use circle metal cutter to cut 7 yellow circles. Brush circles with water; sprinkle with matching Cake Sparkles. Attach to cake with damp brush. Attach bow and streamers. Position hook.