While I haven't personally tried this myself, I did find this solution to the problem on the
official blackberry support forums here.
According to that thread, use your blackberry email and attach the encrypted pictures one by one and send them to one of your own email addresses (obviously so you can receive the pics you sent). Your blackberry will decrypt the pictures to send them and you should receive them in normal JPG format.
According to another thread you can also MMS the pictures to your email, and that should also work.