In advance, make 100 gum paste rose petals: Tint ½ recipe gum paste rose; roll thin and cut with tulip cutter from flower making set.
Cut petals apart, keeping them covered as you work. Place one petal on foam, roll edges thin and curl with modeling stick.
Place on cornstarch-dusted flower former to dry overnight. When dry, grate chalk through tea strainer and brush lightly on petals.