I don't know if this would be under the appropriate boards but I thought I would give it a try. I apologize in advance if it's wrong.
Thanks to Carla of Sullivan, I signed up to a board that allows people to "pin" things they're interested in around the internet. It makes it easier if you want share links with friends. Since I've signed up there, I've linked some of the custom content I've used in my game. It's not full by any means but it could be of help if anyone is interested in finding something that I or another person might have used in their game.