Recently I wrote a short story for my literature class. It's an origin myth about the Greek gods and how thunder came to be. Please excuse any grammatical errors or inaccuracies about the gods (I'm only in middle school!) Here it is:

Hades, king of the underworld, sat in his dark kingdom, contemplating his life. He wondered why he must be forced to watch over the souls of the dead while his brother, Zeus, gets to live and rule amongst the gods. Zeus was no better than he, so why should he rule? Then, Hades had an idea.
“I shall issue a challenge to my fool brother to fight him for his throne!” Hades declared loudly.
Immediately, he ordered Hermes, the messenger god, to deliver his challenge to Zeus. Hermes was fearful of Hades and flew to the heavens as quickly as he could.
“Hah,” Zeus laughed, “Hades wishes to contest me for my position as king? This must be a joke!”
Hermes convinced Zeus that his brother was quite serious. Zeus now grew angry and commanded that Hermes tell Hades that his request was ridiculous. The weary messenger god reluctantly flew back to the underworld at the command of his king.
Hades was not surprised that his brother denied his request. He merely decided that he would neglect his duties in the underworld until Zeus would agree to his challenge. So, he opened the gates of the underworld and allowed the spirits to escape and roam amongst the living as though they were alive themselves. The townsfolk were frightened to see the dead return to earth and even more frightened to see vile monsters, such as those killed by the mighty Hercules, return to reign terror on the living. Not only this, but without the god of death at work no one could even die!
There was even uproar amongst the gods. They were all furious at Hades’ ignorance. Poseidon, the god of the sea, complained that the dreaded Hydra, the 50 headed water snake, had come into his seven seas, causing havoc for the creatures of the sea. Apollo was mad that the Earth was so crowded with people that he couldn’t see all that he could before from his chariot in the sky. Demeter, the goddess of agriculture, was worried that she would not be able to grow enough crops to feed all the people of the over populated world and, being that they couldn’t die, they would have to live with hunger pains forever.
Finally, Zeus gave in. He told Hermes to alert Hades that his challenge had been accepted and they would meet to negotiate what the challenge should be. The brothers talked to one another, but they couldn’t agree on a challenge that was fair for both of them. So, after days of arguing, they decided that their third brother, Poseidon, would come up with a challenge. Poseidon agreed and went off into the sea to think of a challenge.
Hades and Zeus waited for what seemed like an immortal lifetime for their brother to make a challenge. The truth of the matter was that Poseidon had trouble thinking when the issue of an immortal Hydra was still at hand. Amazingly, this problem was just what he needed for an idea. He rushed back up to the heavens to pitch his idea to his brothers.
The contest would be that the two gods would each try to get rid of the evil Hydra. At first, the Hydra would lie sleeping on the island of Icaria, where it had been sleeping every night since Hades released it. As, soon as it woke up, each brother would be allowed to try their own methods of killing the beast. Whoever destroyed it first would be the winner. Poseidon then explained that if Zeus won then everything would go back to the way it was and Hades must return to the underworld, but if Hades won then Zeus would be forced to watch over the underworld and Hades would be crowned king of the gods.
Hades could only laugh at the thought of the challenge. He found it rather funny that Poseidon made a challenge to kill something when he was the god of death. He was sure to win! Zeus was uneasy about the challenge, but he knew it was the only way to stop the madness. So, they agreed that the challenge would take place the next morning, the time when the Hydra usually woke up.
Zeus spent the rest of the day trying to think of a way to kill the Hydra. How could he kill something that’s immortal? He paced the sky trying to think of a solution until it finally came to him. He would not have to kill the beast at all!
The next morning, both gods arrived at Icaria eagerly awaiting the Hydra to awake. Hades, who sure that he would succeed, was too proud of himself. Thinking that there was no way for his brother to kill something without death itself, he even allowed Zeus to take the first shot at the beast. Zeus expected this and was sure to use it wisely. As soon as the snake awoke, Zeus brought down a powerful flash of lightning upon the beast. The lightning did not kill it, but destroyed it instead, burning each of the 50 poisonous heads until they were nothing but dust. He completely removed the Hydra from existence, even so that its soul was gone in its entirety.
Both Poseidon and Hades were amazed at this display of ultimate power. It was clear who the winner was. Hades returned to the underworld bringing all of the souls which he had set free with him, so everything returned to its natural state. The already cold hearted king was now even angrier than ever before. And from that day forward, whenever Hades would see lighting in the sky, the very thing which caused him to lose the challenge, he would let out a roar of sheer anger and jealousy so powerful that it could be heard throughout the earth.

that's actually good a lot better than other Greek mythology's I've read

Thanks! I thought it was a good concept but I didn't know how would turn out.

So, as requested I won't mention the grammatical errors... you know they are there, you can fix them. The story follows the style of Greek myths fairly well, and it was quite amusing. Very enjoyable.