Add the following lines in iconify.css to have the .admin-panel background icons (as seen on the screenshot) :

#iconify-admin-site_building{background: url("icons/admin_sitebuilding.png") no-repeat 5px 0px; padding:0 0 0 24px;}
#iconify-admin-site_configuration{background: url("icons/admin_config.png") no-repeat 5px 0px; padding:0 0 0 24px;}
#iconify-admin-content_management{background: url("icons/admin-content.png") no-repeat 5px 0px; padding:0 0 0 24px;}
#iconify-admin-user_management{background: url("icons/admin_user.png") no-repeat 5px 0px; padding:0 0 0 24px;}
#iconify-admin-reports{background: url("icons/admin_log.png") no-repeat 5px 0px; padding:0 0 0 24px;}