(for samsung juke)
the only tool you'll need is bit pim.
Once your phone is recognized in bitpim
click on the side bar File system
brew>mod>1088
this is where your pictures are stored. I've only tested gif's ^^ and it works flawlessly. if you want a wall paper find out the resolution of your current one. then create one using your favorite graphic imaging program, alternativly you can also take photo's that you have taken on your juke from this folder directly to your PC eliminating the need to Picture text it to your PC ^^ Hope this helps.