Did you send a PM to the maker, cdavis, and ask?
AIt looks like it's all piped
If that is hand piping they sure are good at it!! Very beautiful cake!!!
I reminds me of henna look cakes, just white on white. Lots of intricate piping
It's easier if you use a small set of cutters to mark the outlines in a basic pattern. Then you can pipe away in sections.
I think I tracked it down: http://mypearlescake.com/gallery.php?recordsperpage=12&startrow=180&pagenum=
Pearles Specialty Cake Co.
You could contact them and ask, politely.