Wow, those are pretty! Nice to meet you, and welcome to the forums. I haven't seen patterns for pins specifically, but you could easily adapt any flat beadwoven project to suit your purposes. You might try some of the bead pattern websites if you prefer online patterns, or check some of the beading books that are out there. Some of the books about beaded amulet bags have great patterns that could easily be adapted to pins like that.
BTW, where did you get safety pins with screw-off heads? I've never seen them before, but I can see how they'd be extremely useful.