The leaves on the &#39;n&#39; are a design called ...

The leaves on the 'n' are a design called Hurly-Burly, designed by Helen Breil.

I discovered it roaming the internet in my pre-CZT days. She has other stamp designs that she says are "inspired by the Zentangles meditative, repetitive-pattern approach to drawing."

Going back to look, I realize her leaves are somewhat different, longer for one thing. You can see that stamp pattern here: http://helenbreil.com/index.php?pr=textures2