Decorate brownies. For raspberry brownies, place a fresh raspberry in brownie cavity.
For pink drizzle brownies, melt white candy melts candy according to package instructions. Use pink color from Garden Candy Color set to tint melted candy pink. Use pink melted candy in cut parchment bag to fill brownie cavity. Chill to set, about 5 to10 minutes. Melt light cocoa candy melts candy according to package directions. Use melted candy in cut parchment bag to drizzle zigzags over brownie. Chill to set, 5 to 10 minutes.
For buttercream brownies, prepare buttercream icing according to recipe directions. Use brown icing color to tint icing light brown. Use tip 18 and light brown icing to pipe shells that form a heart shape in brownie cavity.