Based on your query, I recommend using Tome. While it doesn't specifically generate book covers, it does offer a unique feature that could be beneficial for your students' narratives.

Tome uses AI to transform short prompts into complete, visually rich documents. This could be a great way for your students to create interactive narratives. They can input their story ideas, and Tome will generate a full presentation, complete with images, videos, and other media. This could add a visual element to their narratives, making them more engaging and immersive.

Here are some key features of Tome that could be useful:

• AI-Powered Storytelling: This feature can help students transform their short story ideas into full presentations. It's ideal for creative writing tasks.
• Seamless Media Integration: Students can add images, videos, and other media to their narratives, enhancing their storytelling experience.
• Template Options: If your students are unsure where to start, Tome provides starter templates to help them get going with their storytelling.

Tome offers a free trial with 500 credits, and for unlimited access, users can subscribe for $10/month. This could be a cost-effective solution for enhancing your students' narrative projects.