.avatar img,
.avatar .img,
.avatarCropper label,
.avatar.plainImage img,
.avatar.plainImage .img,
.visitorTabs .navLink .miniMe, /* If you happen to have the avatar in the navigation */
.discussionListItems .discussionListItem .posterAvatar .avatar.miniMe img
    border-radius: 50%

Should get you close. I think some weird things happen on the avatar member list but nothing horrible.

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