No clue. However, there's an app called DIY theme creator that lets you use a photo to make a wallpaper right on your phone. Think ownskin, only on your phone.
I posted about it here (http://symbianguru.typepad.com/welcome/2007/01/finally_a_freew.html), though i also received an email stating that it was NOT freeware, though you can download it from Nokia.