Elgg is pretty cool, and not that hard to customize yourself. Just make a copy of the default theme and start editing the css file in /mod/template/templates/Default_Template/css They've got some themes here: http://classic.elgg.org/themes/files/4 But more people have put links to themes here, with discussions about how to theme elgg: http://classic.elgg.org/mod/vanillaforum/vanilla/?CategoryID=8