BuddyPress.org

Howdy, that logo seems to live in css and you can override it by changing this:

#header h1 a {

text-indent: -999em;

background: url(../images/logo.gif) top left no-repeat;

overflow: hidden;

width: 214px;

height: 35px;

display: block;

float: left;

}

line in /themes/buddypress-home/css/base.css. You really don’t want to change it, you really want to create a file in that same directory as base.css and call it site-wide.css

Make your override mods there. There’s a file in there called site-wide-sample.css that explains it.