Note, August 20th: I just discovered a very simple way to add graphics from the Gallery to the background of your header or footer, page, or paragraph.
I would say that a nice big gallery of clip art or other useful graphics is worth way more than a thousand words, if you're trying to convince your users to like OpenOffice.org. (Nothin' wrong with the program, but we know that change can be a pain.) Some users find it difficult to navigate a file system, which is what you need to do if you're using Insert > Picture > From File. And, frankly, dragging from a nice pane of graphics is easier.
When I go to a client site, there's always some resistance among users to doing the switch. However, people just love going through the gallery. The mood definitely changes when people see the graphics and start dragging pictures of cheese and armadillos and yellow school buses onto their documents.
To get a bunch of graphics, just google for free clip art and download it. Here are a few options specifically for teachers.
You might also consider the phenomenal Big Box of Art, vast amounts of clip art for not a lot of money.
So whether you want easier access to pictures or video, or good change management techniques, the gallery is a nice feature.
The locations of all the gallery graphics and other gallery info is stored in openoffice\share\gallery, in the .sdv files. Copy those files to other computers if you want them to have the same graphics, when you're done doing the configuration.
1. Click the Gallery icon or choose Tools > Gallery.
2. The gallery will appear.
3. Click New Theme.
4. Click the General tab, and type the name of the theme that you want displayed in the Gallery.
5. Click the Files tab and click Find Files.
6. In the window that appears, go to the directory containing the graphics. The directory can contain subdirectories; all graphics in all subdirectories will be brought in for you to choose from. Click OK.
7. All the graphics in that directory and any subdirectories will be brought into the window.
8. To add only some, use Ctrl select or Shift select to select specific graphics. Select the Preview checkbox to see graphics. Then click Add.
9. A window will show the graphics being added.
10. Find more graphics and add them the same way, or just click OK. You'll see the graphics in the gallery. To add a graphic to a document, just drag it into the document.
If you need to change the name or add files later, right-click on the theme and choose Properties. This will take you back to the same window.