I don't-- as a general rule-- add a lot of "new" elements to my designs. Most of the time, the designs are merely variations on something I have tried before.
I spent several weeks turning over the idea of just how to incorporate spirals-- a basically round design element-- into patterns that are largely angular and linear. Eventually, I came to the conclusion that I was better off adding the spirals as "accents," rather than incorporating them directly into the pattern designs.
Not many stones lend themselves to having spirals added-- on this stone, they seem to echo the basic "question mark" shape of the main design.
Not sure I am going to try this again, but it has since occurred to me that a string design in a spiral shape might be viable.