I consider the interface itself, to actually be an exercise in graphics design, so I look for what I can use in that area in my design. And I'll take an idea from a hard copy I receive in the mail just as readily as I will take an idea from an electronic source.

I agree - GUI graphics reflect the underlying structural considerations. The structural considerations are universal. Given a similar requirement - an experienced developer in Germany would [most likely] offer a solution very similar to one by an equally experienced developer in Canada.

And I agree - the disk icon is the "save" icon, and the "blank" sheet is the "new" document icon (at least for now). I looking into the details of GUI - I am just groping for ideas of a generalized approach!:)