In the case of the coil pictured..
This is a perfect case of function dictating form.. It's a DD, which is two coils in a figure 8...
Any other shape would not work the same.. The spokes and color are the only option to be changed as far as "looking cool" goes... Attached a crude drawing of the wires inside.. That's why the DD are all similarly shaped..
I would like to see coils with bolder, brighter, colors to see in the water better and at night.. Black coils IMO are the worst, they get hotter from the sun, then sticking them in water, even a cool puddle, can cause a lot of conflicts with the contraction of the outside happening faster than the inside..
Better to splash some water to cool things off and wait a few seconds before dunking.. Especially this time of the year in Michigan...
<°)))>{