I recently built a Plex Media Sever. As we all know, Plex assigns posters in a chaotic and random manner. I would find one that In liked and start adding them, only to find that the whole set was not there. Very frustrating. And for someone with slight OCD this randomness was maddening. Then I found TPDb.
I love the posters created by Aloha_Alona LloydSev DIIIVOY JohnDoranNY CmdrRiker plexantt Samidare and Mattiask57. The vast majority of the poster that I have downloaded so far though are by LloydSev, as in many cases his was the only trading card version there.
I've started using Coverlabs to create some posters myself, to fill in the blanks in my collection of posters. Hopefully I woll improve on that down the track, maybe with Gimp.