For the sides of the cake, I piped a simple dot pattern with a #4 tip, coupler, and disposable piping bag. Then I decorated the top with a ring of buttercream rosettes and a 1M star tip. I added fresh blueberries, raspberries and strawberries, and a few fresh leaves and flower-berries from my garden.
I love the look of fresh flowers on cakes and they make an easy decoration. You can rinse them, trim the stems to about 2 inches, and stick them directly in the cake. Just make sure whatever you use is non-toxic, and remove them before serving. :)