Deep question, Duchess! I don't have the books handy as I'm at work, so I hope I haven't gotten the stories mixed up, but anyway...
Tamarantha represents knowledge gained purely from study of Kevin's Lore, right? Her story draws a picture of a Creator who in anger cast down his enemy, but in the process of doing so harmed his creation. And so the Creator seeks to help his creation survive against the harm (ie Lord Foul) that he has brought upon it.
One
could see in this story some parallel to the story of Kevin: he sought to destroy Lord Foul by invoking the Ritual of Desecration, but in so doing harmed the Land. Yet he also safeguarded his Lore, to help future generations once the Land had recovered from the harm he inflicted.
So, I
could say that Tamarantha spoke as someone who had great faith in Kevin's Lore to light the way for the future of the Land. She had dedicated her long life to that lore; her generation operated on the basic assumption that regaining the lore of the Old Lords was the only way - and one could hardly blame them for that, since they had nothing else.
Hope all that isn't totally off-base...
Foamfollower's story of the Creator's lost children parallels the story of the Unhomed Giants, themselves lost wanderers. I think Foamfollower drew the comparison himself in talking to Covenant. So, the story expresses Foamfollower's yearning to return Home. I'm sure there's more to it, but I've forgotten the details of the story. (Unlike Giants, I don't have totall recall...)
The
Elohim's story...I think I better go home and re-read it first...
The story of the Wyrm is maybe the most evocative, most poetic. I don't recall who told it, though. Pitchwife? Honninscrave? It was during their encounter with the Nicor, and they explain that the Nicor are the "offspring" of the Wyrm. Well, I have a hard enough time wrapping my head around the concept of the Wyrm and the One Tree, never mind wondering what the myth says about the teller.
Oh, yeah, my favorite is the Wyrm story. It's just so...far out, so cosmic. It's another reason why I love The One Tree. That book opens up so much of that world, of which the Land only seems a small (though significant) part of.