Suggested by a guest:

Steven and Peridot swap bodies.

(There was actually a story already with this idea. Can't remember who it was though)

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Both gems were sad recently. No, sad wasn't the right word. It was...crushing. Lapis had left. She took the barn, the meep morps. Everything. But that wasn't the worst part. Lapis was GONE. She had no intention of coming back.

Peridot felt small, empty, and alone. Even if Amethyst and Steven had tried to make her feel better.

Speaking of the hybrid, he seemed sadder than usual as well. He seemed to be in a similar situation. But his friend Connie was still on the planet. He could talk to her.

She just...didn't have the energy to try and help him. That made it worse. She wanted to help him, she just couldn't.

To pass the time she had started learning how to sleep. Her dreams and thoughts would project themselves often. Sleeping did help slightly, and it felt slightly refreshing.

As she settled in for the night, she heard Steven yawn slightly as he finished his routine of washing his teeth at night, this had become common. "Goodnight, Peridot."

Once the light was turned off she relaxed, and felt herself slipping into the void of sleep.

Steven laid in his bed, and looked at his phone. No new messages. With a sigh, he rolled over and drifted to sleep.

As he floated through the dream, he eventually saw another figure. A floating green blob. Suddenly, some strong force shot him forward, and he crashed into the form.

With a gasp he shot up, and immediately hit the top of his head. "Ow! What the...woah! Wait a minute!"

He looked at his arms, and noticed the lime green color. With a gasp he felt his stomach. No gem. As he quickly felt all over, he felt the gem on his forehead. "I'm Peridot?!"

He jumped slightly as the bathroom door burst open. "Steven! What are you doing? Why are you controlling me! Give me back my body!"

Steven looked at...himself...with a guilty expression. "I don't know what I did! I was just dreaming and now I'm you!"

After a few moments Peridot started laughing. "Ah hahahahaha if I'm in your body, That means I'm the leader!"

When she ran out of the room, Steven followed her. "Peridot, wait! You don't know how to use my powers!"

She ran towards the warp pad. "Then I'll learn! I know a great place to train! An old arena that was never finished!"

Before the warp activated Steven tackled her. "No! Peridot, my body isn't like yours! I am half organic, remember?!"

The two began wrestling, constantly moving away, and then towards the warp pad, Peridot using Steven's quartz strength to keep...herself...away.

All the noise caused the Crystal Gems to appear from their respective rooms.

Pearl gawked at the two of them. "Steven, Peridot! What is the meaning of this?! You should be in bed, Steven!"

Amethyst just laughed as 'Peridot' tackled 'Steven' once again.

Garnet adjusted her visor. "This isn't exactly a good time to test your abilities, Steven."

A small smirk rested on her features.

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That's all I got for this idea. I can't make it too long XD