Deadly winterboard theme, tested on ios 4.2.1.
This theme does not include any homescreen wallpaper, so you can set what you wish, or use bosspaper!
In the upgrade to 4.2.1 Apple changed the file location of thee lockscreen and springboard background image. so in order to get around that you have to use iFile go to /var/stash/themes and find your theme's folder. In that folder find the "LockBackground.png" click on that. then at the bottom click on the picture of the file with the little arrow. This should save it to your Photos. then just exit out and go to photos and set it as your lockscreen background :-)
Maybe..you need too reebot your device, to appli for "DEVIL" slider text. It has multilanguage support. If does not work, let me know!