Maybe someone found this in a similar way. What I did: I took a base geometry (f.e. cube) , went to editmode, delete only faces , converted the remaining wireframe to curve, give the curve 'full, dep:.05, res:8', converted back to mesh und applied a subdiv modifier with 3 on it. I found it funny and aesthetic what I have got.
Just curious, do you know about the wireframe modifier? I think it's probably a little faster and/or easier for these shapes. Cool renders!
Sorry for answering so late. The wireframe modifier creates the shapes exactly the same way like in wireframe view. It is not the same that I did. I found it curious that the result was not so regular ...
Very nice! Amazing what tricks people find while tinkering in Blender.
Creative Mind! :)