Customizable Ripples allows you to create a 3d plot of a function like z=fn(x,y), with presets for radial designs, random, or custom arrangements. Based on the awesome OpenSCAD 3D Surface Plotter by dnewman, and similar to ripples in time by tc_fea, I wanted one that had some simple presets.

V1.1 added height coloring to see them better in customizer, but feel free to download OpenSCAD and the source (.scad) file to view and edit on your local computer. This way it can also be modified to plot other functions, just set the "z" function to the one you want to plot.