1. A program where people can write letters to prisoners through a third party - the letters go to a repository where they are taken out of envelopes (and maybe screened) and then they are given to prisoners. Prisoners can then write back through the same repository, which then works in reverse.
2. Giving solitary prisoners letters from kids. Drawings. Maybe not even with names.
3. Start a writing project among the prisoners: one prisoner writes a paragraph or piece, then another inmate takes it up and the story goes around the unit. If there is a worry about secret codes, the stories are mixed randomly with stories among prisons nationwide.
4. Expose the solitary prisoners to chat roulette. Put the camera high enough in the cell so that they can't expose themselves and maybe all anyone can see is their hands or feet (if they stand on their hands). Or blur them.