zsh hooks を使って ssh / mosh の接続先によって Terminal.app のテーマを変える ref: http://qiita.com/mr_konn/items/68fb9af87cf20a217a84

ssh-mosh-bgch-hook.sh

autoload -Uz add-zsh-hook;

unset __WINDOWLOC;
unset __PREVSETID;

function set_bg () {
  osascript -e "tell app \"Terminal\" to set the current settings of the tab ${__WINDOWLOC[1]} of window id ${__WINDOWLOC[2]} to settings set \"$1\""
}

function ssh-mosh-observe() {
    mycmd=(${(s: :)${1}});
    case ${mycmd[1]} in
        ssh|mosh)
            HOSTNAME=${mycmd[-1]};
            __WINDOWLOC=(`osascript -e "tell app \"Terminal\" to selected tab of the window 1" | cut -d' ' -f 2,6`);
            __PREVSETID=`osascript -e "tell app \"Terminal\" to name of current settings of tab ${__WINDOWLOC[1]} of the window id ${__WINDOWLOC[2]}"`;
            case $HOSTNAME in # host name
                sakura-vps) set_bg "Sakura";;
                ubuntu-vm)  set_bg "VM";;
                *)          set_bg "Pro";;
            esac;;
    esac
}

add-zsh-hook preexec ssh-mosh-observe

function ssh-mosh-post() {
    if [ -n "${__WINDOWLOC-}" ]; then
        set_bg ${__PREVSETID};
        unset __WINDOWLOC;
        unset __PREVSETID;
    fi
}

add-zsh-hook precmd ssh-mosh-post