I would limit it to cards and letters. In fact if you want to send (up to PG rated) pictures, it would be best to print them on regular paper. If they feel something odd in an envelope they'll make the recruit open it right then and there and show everyone. Regular paper is cool though.
*Nods* Noted n_n . I'll wait till they're out in the Field to Send em all the Good Stuff then n_n . And thanks for the Tip about the Pics, but I don't think I'll be sending em any n_n .
Also, How did I know what Kind of Glasses your Son Picked XD .
@Cen: *Big Hug* Thanks Cen, I'll keep that in Mind if I can't do it on my Printer n_n .