Potential Paths: Path 1: Using Beautiful.ai for creating high-quality presentations with less design effort. Its Design AI function and drag-and-drop editor allow for easy creation of visually pleasing slides. However, this approach is mostly oriented towards design, not necessarily educational-related imagery. Path 2: Utilizing MagicSlides for creating presentations. The user can allow its AI engine to create engaging slides complete with images and relevant content based on the provided topic. In addition, the customization features provide the ability to make the presentation design align with the teacher's unique style. This software seems more aligned with the teacher's requirements, but the quality of AI-generated content might vary.

Final Narrative:

From the educational tools sourced, it seems that MagicSlides matches your query most directly. This AI-powered Google Slide add-on can generate high-quality presentations complete with relevant imagery based on your provided topic. Its ability to auto-generate slide elements minimizes the time and effort you need to put into searching for and inserting images manually. Moreover, its customization options, including themes, font choices, color palettes, and layouts, can help you align the presentation's aesthetic with your unique style or lesson mood.

Please note that while AI can elevate your slide presentation by generating relevant content and images, occasional inaccuracies may occur due to AI interpretation. As a result, the final content would still need your review and approval. Also, some advanced features in MagicSlides may take some time to master.

In regards to pricing, MagicSlides offers several plans ranging from a free limited feature plan to premium options. Depending on the extent of your needs, you could select a plan that offers more capabilities.

In conclusion, the tool that seems most effective in addressing your classroom needs for presentation software with a high-quality, relevant image library is MagicSlides. It offers the best combination of text-to-presentation automation, customization, and user-friendliness, leading to quicker, visually appealing, and efficient lesson material preparation.