I’m a big fan of all things to do with the forest; some of the first things I figured out how to pipe with royal icing were pine cones and pine needles. Recently I piped a mouse and before I started adding features to it all I could think of when I looked at the body was how much it looked like an acorn. So, today I tried to pipe an acorn on purpose. All that’s needed to pipe acorns are a bag of green royal icing with a round #12 tip, brown icing with a round #3 tip, a dusting pouch filled with a 50/50 mix of cornstarch and powdered sugar, a flower nail, a glue stick, parchment paper squares, and a Styrofoam block to rest the nail in.
Start by piping a short, squatty teardrop on a parchment square with the green icing (you could use brown, too). Hold the tip at a 45 degree angle, squeeze until you build up a ball, then pull away while decreasing and stopping pressure. Touch your fingertips to the dusting pouch then pinch the tip to neaten it up if need be.