voronoi structure around non-voronoi geometries

hey guys.

i am relatively new to gh, but have an assignment in class to do asap. i am kind of struggling with it, but the idea was to have other basic geometries like 3D cubes (or squares in 2D) in a boundary box (or plane in 2D) and then basically construct voronoi cells around it.

does anybody have an idea how to do this? any tips or example definitions that i could work on would really really help.

cheers,

a.