Halfbad (Adam) created something completely original using pieces of original Mattel M.U.S.C.L.E. figures. While the end result is not a custom M.U.S.C.L.E. figure, it retains, and probably builds on, the intrinsic fun and joy of M.U.S.C.L.E. figures.
Designing today..flexing my MUSCLES. – (Link)
It looks like M.U.S.C.L.E. collectors may be getting an exciting surprise in the future.