Cannot be done.

But if you are really into it, you can

1.  associate the image you want to transfer with a phone book entry
using the picture caller-id feature
2.  use phonebackup from christersson.org to back up the phonebook
onto your PC
3.  edit the backup file, removing all irrelevant information, leaving
only the picture data
4.  un-encode the file (the picture is encoded using binhex/uuencode
or something similar, can't remember which scheme)
5.  Voila.. you have a picture transferred.