I want to create an object with a sponge/bubblelike porous structure on the outside. It should be a solid.
What could be an elegant solution?
I’m a newbie to Grasshopper. What I tried so far:

Created a sphere and linked it into Grasshopper:
Brep

Created random points in the bounding box of the sphere:
Pop3D

From the random points, created a 3D Voronoi diagram:
Voronoi³
What happens here is that around each point, a cell is constructed. The surfaces of neighboring cells coincide.

Intersected the sphere with the Voronoi diagram:
SInt
The result still is a sphere. Only it is assembled of irregular cells, and there is no structure on the outside. Steps that would make it work:

After creating the Voronoi diagram, give a wall thickness to the cells.

Intersect the walled Voronoi diagram with the sphere.
I don’t know how to do that with Grasshopper, and I don’t know if it would be a smart solution. Because: There would be unnecessary complexity on the inside, the walled cells that are invisible.