I know that from time to time TG members get to discussing somebodies web design or book cover, or ... and I don't think I've ever heard anyone mention pintrest as a source of inspiration for whatever interests you.
Pintrest essentially draws together posts on a subject so you can follow that genre and see what others out there on the web are doing.
Rather than try and explain it, here's a link for those who have never encountered pintrest. This link kicks off with covers..
https://www.pinterest.com/explore/cover-design/
Enjoy and explore.
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