BibleLockScreens has a great selection of verses, all with really good designs that perfectly fit the slick style of iPhones. The list of verses available is continually growing all of the time.
As far as I can tell, it is only possible with iPhones to choose one background at a time – this is a shame as I think having a selection of verses that change each time you use your iPad would be a nice touch.
To get the pictures as a background you need to save the image into your iPhoto library on your iPhone – and then select it in the main settings application as your background. It would be great if this could be done more easily – but once again I expect the apple iOS does not currently allow this.
I really like BibleLockScreen, so much so it is already in use on my iPod Touch!