I think this is idea who's time has come. I just received a 2004 WA geocoin  
as a gift from my sister and showed it around at the Tucson event today to  
appreciative comments.   These coins are outstanding and the photos do  not do 
them justice.  They have a clear lucite? material over the enameling  to 
protect them  and also it gives them a slight convex surface.   Don't know who made 
these, but they are great.   Also I know a cacher  here in Tucson who is a 
graphic artist, has designed enamel pins before, owns a  jeep and might be 
willing to help with designing.
Golefts
P. E. Thompsen