I am struggling with the creation myth. I have ideas about the oceans giving birth to the land, or at least being tricked into forming it somehow. I have ideas about horses being the ones to do the tricking and being the ones responsible for forming the landscape. I have ideas about other gods becoming involved somehow. These ideas though are all in the air.
The Promethean myth on the other hand is a bit more promising; I think it useful to draw on mythic themes already explored and remembered in Brythonic legend and story.
At a very broad outline at this stage;
mankind lives as hunter gatherers, struggling through hard times and enjoying bountiful ones too. Our hero lives in a time when it is a particularly harsh winter, he sees his family and his tribe dying and starving and so he calls on his gods – I'm thinking horse here as the goddess of the land itself upon which he lives – and she takes pity and reveals that the gods feast well on the meat of an animal know to them as a swine. Our hero makes his way to the realms of the gods and takes a pregnant sow from them – Hen Wen perhaps to pull an idea from existing legend and to fit in with the theme – which he takes back to his tribe and from this sow springs the fruits of agriculture. A quick diversion here; agriculture marks a pivotal point in the developmental history of humans, it is the point where we stop being controlled by the forces of nature around us and begin to take control of our own destiny, settling down, the first towns and cities, the beginnings of our divorce from 'the natural order' (clumsily put I know).
So the gods are mightily pissed off at this point; Belenus scorches the earth to kill the crops, Nodens causes the rivers to burst their banks flooding and killing crops and livestock, disease etc strike.
Here I have begun to lose it, I'm not sure if perhaps tour hero petitions the gods and they take pity, or perhaps they demand something in return or even there is some sort of separation between man and gods. Perhaps Ambactonos steps in. perhaps there is even a split between the gods with some taking pity and others wanting revenge – it might lead to ideas like occasional bad harvests and spoiling being wrought by some of the gods at times.
So much to think about.