Researching Creation Myths to come up with one for orcs has come up with a lot of wierd creation myths. I'm still looking for one to adapt to the orcs.
Here are a few:
The Ainu people of Hokkaidō recount the demiurge with a cosmology consisting of six heavens and six hells where gods, demons, and animals lived. Demons lived in the lower heavens. Amongst the stars and the clouds lived the lesser gods. In highest heaven lived Kamui, the creator god, and his servants. His realm was surrounded by a mighty metal wall and the only entrance was through a great iron gate.
Kamui made this world as a vast round ocean resting on the backbone of an enormous trout. This fish sucks in the ocean and spits it out again to make the tides; when it moves it causes earthquakes.
One day Kamui looked down on the watery world and decided to make something of it. He sent down a water wagtail to do the work. By fluttering over the waters with its wings and by trampling the sand with its feet and beating it with its tail, the wagtail created patches of dry land. In this way islands were raised to float upon the ocean.
When the animals who lived up in the heavens saw how beautiful the world was, they begged Kamui to let them go and live on it, and he did. But Kamui also made many other creatures especially for the world. The first people, the Ainu, had bodies of earth, hair of chickweed, and spines made from sticks of willow. Kamui sent Aioina, the divine man, down from heaven to teach the Ainu how to hunt and to cook.
Damballah (Sky-serpent loa and wise and loving Father archetype) created all the waters of the earth. In the form of a serpent, the movement of his 7,000 coils formed hills and valleys on earth and brought forth stars and planets in the cosmos. He forged metals from heat and sent forth lightning bolts to form the sacred rocks and stones.
When he shed his skin in the sun, releasing all the waters over the land, the sun shone in the water and created the rainbow. Damballah loved the rainbow's beauty and made her his wife, Aida-Wedo. (Aida-Wedo represents the sky powers and is symbolized by the rainbow; wife of Damballah, she shares his function as cosmic protector and giver of blessing.)
The revelations of the loa (deity) descended upon the first faithful in Ifé, a legendary city located in Nigeria. Therefore, everything in life and all spiritual strength comes from Ifé. The homeland of all voodoo devotees, where Ifé is located, is Ginen, from where they were forced to flee in the African Diaspora. In death, the higher soul will return to Ginen (the world of the dead, said to be under the water below the earth) to reside with the loa and the ancestral spirits. Because of this, all practitioners of voodoo refer to themselves as ti guinin, sons or daughters of Ginen.
The Yoruba creator is called Olorun or Olodumare and is often assisted by the spirit, or "lesser god", Obatala. In the beginning, there was only water and chaos. The supreme being sent Obatala or Orishanla down from the sky to create some land out of the chaos. He descended on a long chain (umbilical cord) and brought with him a rooster, some iron, and a palm kernel. First, he put the metal on the earth and the rooster on top of that. The rooster scratched the metal and spread it out to create land. Then he planted the palm seed and from it grew the Earth's vegetation. Olurun named earth "Ife" and the first city "Ile-Ife." Orshilana created humans out of the earth and got Olurun to blow life into them.
The Maasai of Kenya in their creation narrative recount the origin of humanity to be fashioned by the Creator deity from a single tree or leg which split into three pieces. To the first father of the Maasai, he gave a stick. To the first father of the Kikuyu, he gave a hoe. To the first father of the Kamba, he gave a bow and arrow. Each son survived in the wild. The first father of the Maasai used his stick to herd animals. The first father of the Kikuyu used his hoe to cultivate the ground. The first father of the Kamba used his bow and arrow to hunt.