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There are a few ways and im sure real soon
some of the experts here will be answering you
I am new at this but it wasnt too too hard
I use the program iphonebrowser on my pc
when my iphone is plugged in it lets me view all the files in
an explorer mode
I navigated to /var/root/library/summerboard/themes
Every theme has a folder with the theme name and two pics (pngs)
possibly.. 1 is dock.png and the other is wallpaper.png
(they dont Have to be there, they are only when the theme has a
dock and wallpaper) -the inner folder holds the icon.pngs (they can be changed too)
From the theme name folder I removed the wallpaper.png I didnt want
and replaced it with the one I did (keeping name wallpaper.png)
then restart your springboard - wallpaper for your theme is changed
And again, If you wish to wait for the experts or diff methods
I wont take offense - there are some great people on here that
have helped me immensely