Set bloginfo with two different colors. Wrap the first word of the blog title with the <span>...</span> tag.

Set bloginfo with two different colors

//Set bloginfo with two different colors
/**
 * Wrap the first word of the blog title with the <span>...</span> tag.
 * Assumes the Twenty Twelve theme.
 *
 * @see http://stackoverflow.com/a/25096093/2078474
 */

add_filter( 'body_class', 
    function( $class )
    {
        add_filter( 'bloginfo', 'so_25094932_modify_first_word', 10, 2 );
        return $class;
    }
);

function so_25094932_modify_first_word( $output, $show )
{

    // Target the "name" part:
    if( 'name' === $show )
    {
        	// Target the second instance:

            remove_filter( current_filter(), __FUNCTION__ );

            // Modify the first word of the blog title:
            $title = explode( ' ', $output );
            if( count( $title ) > 0 )
            {
                $title[0] = sprintf( '<span>%s</span>', $title[0] );
            }
            $output = join( ' ', $title );
    }

    return $output;
    
}