Location of the Gallery and the objects in it
Graphics and other objects shown in the Gallery can be located anywhere on your computer’s hard disk, on a network drive, or on a CD-ROM. Listings in the Gallery refer to the location of each object. When you add graphics to the Gallery, the files are not moved or copied; only the location of each new object is added as a reference.
In a workgroup situation, you may have access to a shared Gallery (where you cannot change the contents unless authorized to do so) and a user Gallery, where you can add, change, or delete objects.
The location of the user Gallery is specified in Tools > Options > OpenOffice.org > Paths. You can change this location, and you can copy your gallery files (*.sdv) to other computers.
Gallery contents provided with OOo are stored in a location like openoffice\share\gallery. You cannot change this location.