Yes, good old GEON. I have looked at it before but I have not had the time to analyze it and match it to my construction. What I have shown were just examples. There is another interesting one that may also be of an interest to you. Notice fig.5.
The Dirac - Kerr-Newman electron.
http://arxiv.org/PS_cache/hep-th/pdf/0507/0507109v4.pdf
The author has even a recent paper that revolves around the same idea but adds superstring theory to it. And Twisters.
Complex Structure of the Four-Dimensional Kerr
Geometry: Stringy System, Kerr Theorem, and Calabi-Yau Twofold
http://arxiv.org/pdf/1211.6021.pdf
He even revives GEON in this paper (section 4)
Gravity vs. Quantum theory: Is electron really
pointlike?
http://arxiv.org/pdf/1112.0225.pdf
As a matter of fact my theory is nothing but a generalization of Buffon's needle which connects to other main concepts used in physics, but I am not exactly sure of what the connection exactly is.
http://en.wikipedia.org/wiki/Buffon's_needle
http://en.wikipedia.org/wiki/Integral_geometry
http://en.wikipedia.org/wiki/Integral_transform
http://en.wikipedia.org/wiki/Radon_transform
http://en.wikipedia.org/wiki/Penrose_transform
http://en.wikipedia.org/wiki/Twistor_theory