Lightly grease four 4-oz ramekins. Cut the gelatin leaves into 1/2-inch strips. Add 2 tablespoons of water to a bowl. Add the gelatin sheets to the water (or sprinkle powdered gelatin over the surface of the water). Let sit for 10 minutes.
In a small saucepan, gently heat a 1/2 cup of milk and 1/4 cup of honey. Do not let the milk boil. Add 3 tablespoons of the herbs of your choice, then take the saucepan off the heat and cover for 10 minutes.
Lightly reheat the milk, turn off the burner and add the gelatin, stirring until dissolved.
Add the heavy cream to a large measuring cup with a pouring spout, then pour the milk, herb, and gelatin mixture through a fine mesh strainer into the cream (be sure to press as much of the milk and gelatin out of the herbs as possible).
Stir the cream and gelatin mixture thoroughly and pour into the greased ramekins. Chill covered for 6 hours or overnight.
When you are ready to serve, slide a knife around the edge of the ramekins and unmold them onto a plate. Alternatively, simply serve the panna cotta in the ramekins with any additional garnishes (such as fresh herbs, flowers, or fruits) on top.