Note: Do not install all of the backgrounds at one time. Choose several that you would like to install by opening the Quicklook PDF file.
Transfer to your BlackBerry device using the recommended transfer method. For most Blackberry devices this can be done using the Media Manager which is part of the BlackBerry Desktop manager.
Open the BlackBerry Desktop Manager -> open the Media Manager -> transfer the files to either the device or a media card
USE
Open Media on the mobile device -> open Pictures -> Open either Device Memory or Media Card -> find and click on the background file -> click again to display menu -> choose Set As Home Screen Image -> return to the Home Screen