Styling coiled bonsai - bankan
This shape is some times similar to informal upright bonsai but has many curves and twists that look like a coiled sneak.
Key points to make this shape
1. curve and twist the trunk and branches as many times as you want ( there is no limitation )
2. best if the curves and twists look like a coiled sneak.
3. very unnatural looking for any plants

view coiled style image(external site)
Recommended trees
pines ( trees with soft trunk and branches )