Create your own loopy trig tube by varying the coordinate functions. Make it circular or wild; avoid self-intersection, or not. Change color, thickness and opacity. Show parametric equations for the curve or have the curve draw itself.
Snapshot 1: show equation
Snapshot 2: thickness and opacity
Snapshot 3: extra wiggly
 D. Bach. "Vine Superloop." 3D Model on Sketchfab. (May 8, 2020) bit.ly/2SHScoG.