Pour cold water into microwave-safe cup and sprinkle with gelatin. Wait 5 minutes, then heat in microwave for 15 seconds. Gently whisk together yogurt, cream and honey - then stir in gelatin. Add food coloring to get it the color you want.
Divide mixture among 6 small glasses or molds. Chill for at least 3 hours. Run knife around edges of cups to unmold panna cottas onto plates.
Top with fresh raspberries, whipping cream, or fancy chocolate.