Workflow

In order to create a VoronoiGeometry you have several options you should think through and decide:

VoronoiNodes, i.e. the generators of your mesh can be:
- periodic, so you may look here
- non-periodic
  - fully customized by the user, here
  - destributed according to a density, here
The domain, i.e. a Boundary object. Those could be
- rectangular
- customized, including (partially) unbounded domains
The integrator argument. This basically choses between sole geometry calculation and various integration techniques, see here
The integrand, which is optionally a function that you whish to calculate the local integrals over cells and interfaces.