Add a screensaver to your blackberry with ScreenEngager Dynamic 5. You simply email pictures to your Blackberry and the software does the rest. Once you have emailed the images to your phone, no network access is required to change to other images in your inbox, and this makes image presentation and selection very quick.
It supports both JPEG and GIF image types. You also get access to the optional, cost-free image processing station, to ensure minimal memory consumption.