Having a tire track on a ground driven by a spline for a example . Decades agp I loved Creative House Expression for so called "skeletal strokes" . Splines where you could make up to 10 randomlly alternating fragments smoothly deformed along a spline.
Also spline based scatterers with precise control how much spacing and offset objects are getting off the spline . It had been much more controllable than typical SD splatters.
It had been my first perfectly non destructive and procedural soft for textures in early 90th .