done in a circle design built on multiples of nature symbols, which was common in older chinese design. Also have textured the leaves shape to represent ground or crushed herbs. (I could change this to a different pattern in the leaf or no pattern if you like the symbol.
I have one other entry I was just ready to upload if you have any desire to see it. Includes the ying yang, leaves and the "impression of a needle shape, but not recognizable as a needle. But I can't upload unless I am at least temporarily in first place until I get it uploaded. So, if you decide you would like to see, please instant message me so that i don't miss the opportunity. thanks. (Apparently you closed it early?)