Royal icing sweet peas definitely don't have the amazing smell of the real thing, but I think they look almost as good! All you'll need to pipe them are a glue stick, parchment squares, a flower nail, a Styrofoam block to rest the nail in, and a piping bag fitted with a #104 rose tip and filled with stiff consistency royal icing. In this case, I used the striped bag from the striped roses, again with the narrow end of the teardrop-shaped tip aligned with the stripe.
Peel away the parchment when the sweet pea is dry. Sweet peas come in almost every imaginable color, so have fun with them. You'll want to pipe them with lots of vines and leaves to add to the realness.