The wild rose is a minimalist flower with slightly cupped petals, and you can find them in just about every shade of pink imaginable (as well as white and colored edge varieties). Here's what you'll need to pipe them…
Medium consistency royal icing in yellow and pink, a round #2 tip on the yellow and a #104 petal tip on the pink, a glue stick, parchment paper squares, a Styrofoam block, a flower nail, and (optional) a 5-petal template decal (designed for piping apple blossoms and primroses) on the nail. Start by sticking a parchment square to the nail with a dab from the glue stick.
When you view the petal from the side, it should look like this: