You absolutely can decorate toffee apples, just like you can caramel apples but make sure to have everything ready before you start coating them. Dip them in the toffee, let the excess drip off, then immediately dip them in your decorations. Great decoration ideas are mini chocolate chips, m&ms, cookie crumbs or other small candies. You could also drizzle melted chocolate over them once they’ve set. If you’re making them for Halloween, why not add some edible eyes.