SimplyClever-'s post in avatar moving 4 side was marked as the answer
this will add a simple rotating animation effect to your avatars, same as here in NulledBB
go to your skin --> css --> ipb_styles.css
locate:
.ipsUserPhotoLink:hover .ipsUserPhoto {
add to it:
-moz-transition: all 0.5s ease-in-out;
-webkit-transition: all 0.5s ease-in-out;
-o-transition: all 0.5s ease-in-out;
-ms-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
-moz-transform: rotate(-360deg);
-webkit-transform: rotate(-360deg);
o-transform: rotate(-360deg);
-ms-transform: rotate(-360deg);
transform: rotate(-360deg);
