The Baptist’s Prayer
I'm intrigued by the idea that the Lord's Prayer originated with John. Joan Taylor argues this in The Immerser: John the Baptist Within Second Temple Judaism, pp 151-153, and I'm a bit surprised her view isn't more commonly held. In Luke (11:1) the "Our Father" prayer is prefaced by the disciples asking Jesus to teach them to pray "as John taught his disciples". The Greek wording, as Taylor notes, could mean that the disciples are asking to be taught "just as" or "exactly as" John's disciples were taught. The Lord's Prayer, furthermore, would fit well with the message of John no less than Jesus'. And I agree that it's hard to see why Luke would want to invent this idea (Matthew's parallel account lacks this reference) which makes it look like the savior is copy-catting John.
Taylor's suggestion prompts the more general question: if the Lord's Prayer came from John, what else did? Did John speak in parables? Address Torah issues? Have certain ideas about taxation? One wonders. Jesus surely had plenty of novelty, but I suspect that his mentor left his mark on him more deeply, and in more ways, than usually assumed.