My vision of the ultimate star wars episode 8 ending:
After training with Luke in the jedi temple, Rey is as strong of a jedi as Luke was in episode 6. She leaves with the green lightsaber to go fight Snoke. After landing on a snowy/ashy planet their lightsaber battle begins. Rey unleashes her green saber and Snoke reveals a larger BLACK saber. Rey is immediately startled by it but quickly remembers how strong she is and then she attacks. Snoke counters every strike and and it soon becomes evident that he is on another level, too powerful for her. He begins a brutal assault on Rey where he slashes and cuts Rey so badly only her strength with the force prevents the Snokes lightsaber strikes from dismembering her. The black lightsaber, representing the dark side of the force, cuts deep into her skin all over her body and she falls too the ground, near death. As she lies on her back looking up at the dark night sky, she sees stars, moon, then a shooting star. As Snoke walks up to finish her the shooting star begins to change direction. It then slams with a huge force that knocks Snoke backwards 100 ft or so. It turns out that the shooting star is actually Luke in some kind of rounded cone shaped pod. He walks out with the classic brown robe/hoodie and retrieves Rey, puts her in the pod and sends her off to space, heading to the nearest resistance base.
Now it's just Luke and Snoke on this planet. He takes of his robe, wearing all white underneath. On his back is a huge cylinder looking device about 3 times as big as a regular light saber. As he takes it off his back it becomes evident that it is a new lightsaber he has constructed from knowledge gained at the first jedi temple. As his lightsaber is wielded, it is WHITE and slightly larger than Snoke's lightsaber. They begin to battle. With every clash of the white and black sabers, a huge burst of energy projectiles through the planet and ripping a hole completely through the planet. Clash after clash, burst after burst, the planet is becoming unstable and on the verge of exploding. Luke flawlessly beats Snoke, destroying the black saber, then jumping up with an upper slash soaring 10 ft above Snoke, then using the force accelerates downward slashing through Snoke a final time. Snoke is annihilated. But the planet is so unstable it explodes. Luke holds his saber in front of his face, closes his eyes, like Obi won Kenobi did in episode 4, and dies. Rey sees all as she has been in low orbit and then shoots away from the planet just as it explodes.
Rey recovers, and returns to the jedi temple. Her training resumes. The screen turns black. After a few seconds, you hear heavy breathing. Then a voice(recognizable as Rey's) says "I feel a great disturbance in the force". The screen turns from black to a view of someone's closed eyes, forehead, and nose. Their(Rey's) eyes open and the sound of a lightsaber opening is heard. And a bright white glow is on her face. Music plays as scene closes, roll credits. The end.
And there has to be super awesome dramatic music for each of these scenes. The music makes it that much more epic.
Star Wars Episode 8: Power of the Jedi