Extravaganza may be an exaggeration. Here you can find some screenshots and music. I may expand this section in future as I replay or rewatch the series and if I ever get around to scanning in my artbooks.
Taken by myself from the Steam version of Final Fantasy VII. The images open in a lightbox and are quite large. You can navigate between them using the arrow buttons on your keyboard, and use Esc can be used to exit the lightbox. You can use these however you wish, all I ask is that don't hot link the images.