"It should use a couple bright/bold colors to stand out, catch attention, and convey clearly the purpose and subject of the book."
The author presented various examples for nonfic books in the market and Fatal Conveniences by Darin Olien caught my eye with its usage of 3D elements.

Using 3D software, I decided to have most of cover info on a bottle of pills that seemingly not printed perfectly to showcase the idea of the book—that something is off yet dismissed.