This appears to be a hosted only addon called Avatar Pool: https://support.vanillaforums.com/discussion/5765/is-it-possible-to-define-a-preset-of-avatars-we-create-for-our-users-to-choose-from-hosted-version This seems easy enough to create, go for it! Plugin quickstart:…
i'm searched the community, almost the answer is you can not do this ,but when i tried this forum, they did it. when you click "change picture", you got this: when i check the source code found this: is this addon? but i cant found a addon named avatarstock or any post include "avatarstock"