One day in advance, decorate turret towers and turret peaks and make flowers.
Ice 4 small and 1 medium turret from Romantic Castle Cake Set smooth with pink royal icing and sprinkle with Cake Sparkles?. Outline windows on turret towers with tip 4 royal icing and sprinkle with Cake Sparkles?; let dry. Use royal icing and tip 225 to make 23 pink and 23 violet drop flowers with tip 3 white royal icing dot centers; let dry.
Cut foam core board 18 in. wide x 14 in. high and cover with Fanci-Foil Wrap. Tint 30 oz. of fondant brown, roll to 1/4 in. thickness and cover board that has been brushed with piping gel. Set aside.
Bake and cool Mini Tasty-Fill? cake and position on foil-covered 6 in. cake board. Lightly ice cake with buttercream icing and cover with fondant.
Bake and cool book cake. Ice top and sides of cake smooth with buttercream. Cover top of cake with fondant. Comb sides of cake with small-tooth side of decorating comb. Grate chalk through a tea strainer and use decorating brush to apply chalk around top border of pages. Cut hidden dowel rods to 2 3/4 in. and insert in book cake to support 6 in. cake board holding castle. Position turret towers around cake and attach with icing. Pipe tip 4 door and doorknobs with pink royal icing. Tint 8 oz. of fondant green, roll into assorted-sized balls and position around bottom of castle. Position castle on cake. Attach turret towers with icing. Pipe tip 2 vines around edge of cake and position flowers. Write tip 2 violet message. Pipe tip 6 bead bottom border.
*Note: Combine Rose and Violet for violet shown. Combine Brown and Red-Red for brown shown.