How does one create the design on the top two tiers of this cake?  It's really pretty but I'm just not sure of how to do it.  Thanks for your help!

http://ohbestdayever.com/wp-content/uploads/2017/01/chic-vintage-buttercream-wedding-cakes-with-rustic-burlap-flower.jpg

Just take a small offset spatula and drag it horizontally across the tier randomly.  Really easy and forgiving.