Only way is to use jl_cmder to take screenshots when blackberry is showing full screen wallpaper preview of those. In order to do so, you need to install older OS that still has those wallpapers. :(
Or use the guideline to install those wallpapers anyway, then take screenshots of missing ones, then uninstall those wallpapers again?
"There is no reason anyone would want a computer in their home."
- Ken Olson, 1977
( And we now wear them! Blackberries are computers too! )