Pre-requis : install rootsh.install (that give you the hand into your device by typing sudo gainroot)
1 / How to Add 9 dektop into Nokia N900 ?
You can install Winscp on your PC and control your phone cell by intalling OpenSSH Server on your device .
a) Install OpenSSH on your device
b) open a SSH connection on port 22
c) make a find on one of your favorite wallpaper for instance « digital_nature1_03.jpg »
ex :
sudo gainroot find / -name "MyBackground.jpg" -print 2>/dev/null
d) install hildon menu (you can find it into the apps manager)
gconftool -s /apps/osso/hildon-desktop/views/5/bg-image -t string "/home/user/MyDocs/.images/digital_nature2_02.jpg" gconftool -s /apps/osso/hildon-desktop/views/6/bg-image -t string "/home/user/MyDocs/.images/digital_nature2_03.jpg" gconftool -s /apps/osso/hildon-desktop/views/7/bg-image -t string "/home/user/MyDocs/.images/digital_nature4_02.jpg" gconftool -s /apps/osso/hildon-desktop/views/8/bg-image -t string "/home/user/MyDocs/.images/digital_nature1_04.jpg" gconftool -s /apps/osso/hildon-desktop/views/9/bg-image -t string "/home/user/MyDocs/.images/digital_nature1_03.jpg" gconftool -s /apps/osso/hildon-desktop/views/active -t list –list-type int [1,2,3,4,5,6,7,8,9]
Result : 9 nice desktop 
Open a Notepad File Win key + Notepad
Enjoy !
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