BuddyPress.org

Put this in your default.css:

li a#user-events, li a#my-events { background: url(../images/calendar.png) 88% 52% no-repeat; padding: 0.55em 3em 0.55em 0 !important; margin-right: 0.85em !important; }

The image should be ca. 15 x 15 px.