I know that the wallpaper can not be changed without Winterboard or alike...

BUT, i was wondering if the background to the iPhone Springboard was a fill color.
Could a ".plist" file be edited some where to change it from black to blue or red or something?

AND could someone help me accomplish this or point me in the right direction of the file please...
I HAVE SEARCHED THE NET FOR A COUPLE HOURS NOW BTW! (before people start saying Google is my friend)

NOTE: i do not wish to use Winterboard to do this i only want to edit the files directly.
Thank you in advance all help is appreciated.