The only two I have to contribute are:
Stan Pike used a three leafed clover without a stem, or triangular windows.
G. Marinonni of Montreal Canada generally used a Maple leaf, but also occasionally used a block "M", and for the Quebequois, would use a Fleur d' Lys.
Tom Adams, Shrewsbury NJ
John Jorgensen <email@example.com> wrote: Alan Goldsworthy asked about a comprehensive list? How about those motifs on bikes from other-than-Italy?
Malvern star used a six pointed star.
Confente used a spade, so did some others I have seen, just not enough examples of.
Sachs has used all four suits on his fork reinforcements, "cause the supplier had plenty of them"... if I remember correctly. So has Brian Baylis, although he probably cut out his own vs. a buyout.
top of the memory has run dry.