[robertlf]

Nice idea but the vertical titles are too hard to read. Why not just stack the books one on top of the other for the sake of usability?

[Xeronate]

I think the vertical tiles could be okay, but color contrast needs to be improved.

[webmaven]

I find the mismatch between the cover and the spine somewhat dissonant. It would be great if an approximation of the background and text colors, and perhaps typeface as well, could be extracted from the cover image (perhaps with something like Tensorflow.js).