Hi,

the icons for Oci store is located here: /usr/share/icons/hicolor
I'm not sure if the maemo icon is also there, but the webpage thumbnails aren't. I don't know were these are...

You can see that I changed the Icon string in the .desktop file to =general_gmaps. This is an Icon I made for this link and put it in the mentioned folder (general_gmaps.png) You can put ever other *.png file in this location and link it to you shortcut.