This plan is structured around the observation expressed by G. B. Caird in The Language and Imagery of the Bible, p. 177-178:
Man begins with the familiar situations of home and community and derives from them metaphors to illuminate the activity of God; but the application of these terms to God establishes ideal and absolute standards which can be used as instruments for the remaking of man in God's likeness. Man is created to become like God, and the ultimate justification of anthropomorphic imagery lies in the contribution it makes to the attainment of that goal.
I used my own topical Bible and Hymn references (Shepherd and Shepherds), and added some connections from Kenneth E. Bailey's Finding the Lost: Cultural Keys to Luke 15.
The sources may claim some originality; the plan itself unfolded very simply from the sources.
The subtitle "Shepherd of Israel and Mine" is the beginning of a famous hymn by Charles Wesley, not available in our books. The reading, "O, holy Jesus, how hast thou offended?" is a very famous hymn by Paul Gebhardt, a German reformer, also not in our books.
The first two songs are drawn directly from psalms that include the "shepherd" motif as a side note. They serve to indicate the ubiquity of the theme in the Bible.
Psalm 23 is well represented in the hymnals. I ordered the choices by ascending familiarity. Note that most of these songs are very familiar: and if all the songs are familiar to the congregation, an important goal of these plans has not been achieved. The selection should take into account the musical background of the congregation. In a very weak congregation, "Orlington" may be the only possibility; in a stronger congregation one might even consider singing "Ah, Holy Jesus, How Hast Thou Offended?" and using "O Thou, In Whose Presence" as an invitation song.