Export is to text files: gedcom, xml (also packaged), ..., import is the inverse.
In 3.0 the family tree manager and a family tree are represented by the GRAMPS symbol, a pedigree in brown colors.
So perhaps import icon could be a text file with arrow to the gramps pedigree, and export the inverse?

At the moment we have decided for 3.0 on the tango style: http://tango.freedesktop.org/Tango_Icon_Theme_Guidelines
You can download that theme ( http://tango.freedesktop.org/Tango_Icon_Library). To see our icons, the easiest is to download the source:
http://www.gramps-project.org/wiki/index.php?title=Brief_introduction_to_SVN#Unstable_development_version_3.0
or
http://www.gramps-project.org/wiki/index.php?title=Running_a_development_version_of_Gramps

and in the downloaded directory navigate to the dir src/images. There you find in scalable all svg. All icons in the images directory still have to be redone to Tango guidelines. So the import and export icon you find there is the old one.

Benny

2007/11/13, Jason Simanek <jsimanek@gmail.com>:
I'll take a look at the SVG files available on the link you provided and
try to work in the same fashion. Perhaps there could be some discussion
on the graphic direction any of you had in mind for the import/export.

Jason M. Simanek

On Tue, 2007-11-13 at 15:43 +0100, Benny Malengier wrote:
> Great!
>
> Just note that the icon set must be cc attribution or GPL or one of
> the other open creative licenses. That is needed for inclusion in eg
> Debian repos.
>
> I did most of the new icons by reusing elements of other free icon
> sets, but for import/export of genealogy data, I have no idea myself
> how to represent this. And as I do mostly coding now, I am hard
> pressed to find time to do icons.
>
> Benny.
>
> 2007/11/13, Jason Simanek <jsimanek@gmail.com>:
>         Hello,
>
>         I am a graphic designer/web developer. I just joined this
>         mailing list
>         yesterday. I tried writing an introduction to my interest in
>         GRAMPS
>         yesterday, but it was rejected. If this goes through
>         successfully, I'll
>         send that again later today.
>
>         I am interested in contributing to the icon set for GRAMPS.
>
>         -Jason Simanek
>
>         On Tue, 2007-11-13 at 10:06 +0100, Benny Malengier wrote:
>         > Hi,
>         >
>         > should anybody have time and creative talent, we could use
>         new icons
>         > for export and import in development version.
>         > Submissions must satisfy Tango guidelines and be 48px x 48px
>         svg, see
>         > details:
>         >
>         http://www.gramps-project.org/wiki/index.php?title=GRAMPS_icon_set
>         > See trunk for how the present icons look.
>         >
>         > Benny
>         >
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>