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Create Ubuntu Wallpaper Change Automatically

Wallpaper is an decoration for desktop, its make more beauty for appearance, but kind a boring to watch the same wallpaper over and over again.
On Ubuntu 9.10 (karmic Koala) by default you can find Cosmos as automatically wallpaper changer and it is beautiful, wallpapers will automatically change in every 30 minutes.
How ever, for previous Ubuntu such as 8.10 or 9.04 the wallpaper changer is not set by default, so you have to add and install it by your self.
I use wallpaper tray rather than wally or other thing, 'coz wallpaper tray is supported by community and its ready on synaptic or repository.

Installing is an easy way, just follow this little tutorial about how to create wallpaper tray :

1. go to : System >> Administration >> Synaptic Package Manager

2. Type "wallpaper" on Quick search, than find "wallpaper-tray", click it at the box on left.

3. Mark it for installation.

4. Click on Apply to install wallpaper tray. (make sure you have connected to the internet or
DVD repo ready).

After finishing installation, close synaptic package manager.

Wallpaper tray will not show at Applications, Place or System, so where is it? It shows as panel bar properties. (see update below at the bottom for previous versions of Ubuntu)

5. Right click at panel bar and choose Add to panel...

6. Find Wallpaper Tray, its alphabetical and click it to give an highlight.

Than click at Add button and close it.

(If you not / can't find it here, than you have to re-booth / restart your system)

7. Wallpaper Tray application will shows on panel bar (its shows an image of your wallpaper).

8. Right click on it and select Preferences.

9. Make any change at More Options to fit your need, or just following mine.

10. Now click at Directory List to add directory of your images (where your wallpapers are).
Make sure you have already set your wallpaper folder created, and click Add button.

11. After you have choose your directory wallpapers folder, click at Apply button.

Your wallpapers will change automatically now, close everything to make sure it is works, watch it change exactly as you wish for rotating interval.

To make wallpaper tray run at the first time every times you log on, just execute it on StartUp Applications.

12. Go to : System >> Preferences >> Startup applications

13. Choose Startup Programs and click at Add button.

14. Type : wallpaper tray at name and command, like the picture below and save it.

15. Done !!!

You will have very nice automatic wallpapers changer and its works very smooth.... Enjoy !

Update :

For Ubuntu 8.04, Blankon Meuligoe or other distro before JJ 9.04, you might see Wallpaper Tray application at : Applications >> Graphics >> Wallpaper Tray

(I did not realize that the place of this applications is different from JJ 9.04 that I used)