"Mainly, I see Jesus as "activist," if you will. Sage, prophet, commentator, charismatic leader. Social and political turmoil was high during the Roman occupation of the Palestinian coast. Without going in to much detail, I think that Jesus' life, as touched by and in tune with God, stands as a demonstration of what every person's life can be, and his death (reasonably inevitable though it was) became the proof that we must be willing to sacrifice everything for what is right (don't confuse this with sacrificing everything for what we think God wants!). Most of us would be willing to sacrifice most of what we have for a few people; Jesus was willing to sacrifice everything he had for all people (even those who hated him), because it was the only "righteous" conclusion to his life to that point (to run away from death would have made him simply another fleeting character in a history book, full of a sense of fairness but unwilling to fulfill what was necessary to plumb the depths of unfairness). In that sense, the atonement doesn't have anything to do with judgement or sin or debt, but is instead a beacon of what is attainable at the limits of human nature. Atonement is being willing to lose everything for nothing; the natural outcome of utter sacrifice."
Both John and nuclear.kelly's view are really meaningful to me and could lead to a lot of great discussion!
The version I will offer here is still one of substitutionary atonement. It maintains that Christ still takes the place of sinners in a sense. But it removes the "penal" part, which is the idea that Christ's sacrifice was to appease God.
This interpretation is one along the lines of Ghandi's hunger strikes. By taking this physical burden on himself to protest potential combat between Muslims and Hindus, he convicted the hearts of both sides and, at least for a while, led them to avoid conflict. His was a substitutionary atonement.