Tint fondant Pastel Yellow using Lemon Yellow with a little Golden Yellow. In advance: Make stars on wires. Roll out primary fondant 1/8 in. thick and cut 18 stars in each color using medium Cut-Out.
Place on cornstarch-dusted surface. Brush tops with water and sprinkle with matching color Cake Sparkles. Let dry. Bend a hook at end of each wire.
Make a teardrop-shaped base for each star, using a 1/4 in. ball of matching color fondant. Insert hooked wire into narrow end of teardrop, shape to wire and let dry in craft block.
Attach star to base with melted candy. Let set.
Prepare 1-layer 14 in. cake and 2-layer 6 in. cake (bake two 2 1/2 in. layers to create a 5 in. high cake) for stacked construction. Assemble cakes on a triple-thick cake board or foamcore base, wrapped in foil. Ice cakes smooth. Divide 6 in. cake into 10ths and 14 in. cake into 6ths.
For 6 in. cake, roll out pastel yellow fondant 1/8 in. thick. Using straight-edge cutting wheels and striped embossing wheel from Ribbon Cutter/Embosser, cut 10 strips.
Trim to 5 in. long and attach with buttercream at division points. For 14 in. cake, cut dowel rods into six 2 in. lengths; insert at division points, 1 1/2 in. from edge of cake.
Pipe tip 8 bead bottom borders on both cakes. Roll 3/8 in. pastel yellow balls and attach with buttercream for top borders. Roll out primary blue, green and red fondant 1/8 in. thick.
Cut message using alphabet Cut-Outs; attach with icing. Make 6 groups of wired stars, using 3 stars in each color; twist together at bottom.
Insert fondant in dowel rod to stabilize wires. Insert star groups in dowel rods. Roll a 1 1/2 in. log of pastel yellow and wrap around wires at dowel rod opening.
For topper base, roll out fondant 1/2 in. thick and cut a circle with cookie cutter. Position base and topper.