From that link of atonement models, the moral example theory is the solidarity model of atonement. I'd personally call the solidarity model the best possible option for liberal Christians:
(Joe) Metacrock has a page up on this:
http://www.geocities.com/metacrock2000/Theology/salvation_others1.html
The Bible, in fact uses a number of metaphors to describe the person and work of Jesus.
I outlined many of these in my own "Images of Salvation Guide:
http://www.after-hourz.net/ri/ios1.html
I find the ransom theory from section two of particular interests. Why? Jesus' death is explicitly called a ransom in scripture. But the question is a ransom for what?
My thoughts were these:
The ransom theory says that Jesus' life was a ransom paid for the sake of our salvation. In many circles this view has been scorned and largely rejected as naive. A ransom is something paid to a captor for the release of something or someone. In this case it is asked to whom did God have to pay or simply find it good to pay a ransom for us? To himself? God holds us captive? Surely that is false. To those who believe he is a literal being, what about a ransom paid to Satan? Does the enemy hold us captive and was Jesus' death a ransom allowing us to be freed from him? This cannot be seriously maintained either. The notion that God would need to or even should find it good to pay anything to Satan for our salvation is ludicrous and quite simply, bad theology. What about sin? Surely we were captives to sin before being liberated? As Richard Purtill wrote, "To say we were captives of "sin" is good New Testament language, but sin is not a personal agent who can be given a reason to release us." The objection against the the ransom theory then, is that there is no one to whom God could have paid a ransom to.
This view is not easily dismissed by Christians who hold to the authority of scripture. In Mark 10:45 and Matthew 20:28 Jesus is the "Son of Man who did not come to be served, but to serve, and to give his life as a ransom for many". As Mentioned by Borg, in Luke's inaugural address (4:18-19) Jesus is sent to "proclaim freedom for the prisoners" and to"release the oppressed." In 1 Timothy 2:6 Jesus is the mediator between God and man who "who gave himself as a ransom for all men". Hebrews 9:15, in the terms of sacrificial covenant, also says that Jesus "died as a ransom to set people free." As we saw above in Marcus Borg's discussion, the idea of bondage and liberation abounds in biblical usage. We also see that the ransom theory has wide scriptural support. So the question remains? Who has us captive? To whom are we prisoners of?
One possible answer is actually right under our noses and was implicitly stated by Borg. Who has us in captivity? We do! We are our own captors and Jesus' death was a ransom which frees us from ourselves. We hold ourselves captive and God, through Jesus' death on the Cross, paid a ransom to us so that we might be released from ourselves. He wanted to liberate us from our own enslavement to sin and to reconcile us to himself. That is why Paul proclaims in Romans 5:8 that "God demonstrates his own love for us in this: While we were still sinners, Christ died for us." Through Jesus' sacrificial death God tells us that he loves us and by telling us that He loves us, He gives us good reason to release ourselves from captivity.
Releasing ourselves from captivity is the same as "reconciling ourselves with God' or "getting over ourselves". God empowers our return but reconciliation is a two-way street so the Ransom theory ties directly into the solidarity model of Jesus' death. Jesus' death creating solidarity between men and God is good New Testament theology as opposed to the more common penal substitution soteriology
And yes, penal substition probably did start around the eleventh century or something in some sort of fuedal society IIRC.
I outlined a ton of problems with literal forms of penal substition here:
http://www.after-hourz.net/ri/ps1.html
Vinnie