Hello there! Based on your needs, I would recommend Midjourney AI. This tool specializes in generating images from text descriptions, which aligns perfectly with your requirement for creating culturally-specific 2D images.

The key feature of Midjourney AI that would be most beneficial to you is its Text-to-Image Generation. This feature translates text into visual content, making it ideal for creating custom visual aids for classroom teaching, including diagrams and illustrations. You can provide culturally-specific descriptions, and the tool will generate corresponding images.

Additionally, Midjourney AI offers a Style Transfer feature. This allows you to adopt the style of one image into another, which could be useful if you want to maintain a consistent visual style across your student projects.

Please note that Midjourney AI operates exclusively on Discord and uses text-based commands, which might present a learning curve if you're not familiar with the platform. However, once mastered, it can be a powerful tool for your image generation needs.

In terms of pricing, Midjourney AI employs a subscription-based model with multiple options, so you can choose the one that best fits your budget and needs.

I hope this helps! If you have any other questions or need further assistance, feel free to ask.