[Plugin: WP-Cycle] Resize background?

yes, you have to edit in wp-cycle.php file of your wp-content plugin.
wordpress/wp-content/plugins/wp-cycle/wp-cycle.php & edit the w*h in this code:

$wp_cycle_defaults = apply_filters(‘wp_cycle_defaults’, array(
‘rotate’ => 1,
‘effect’ => ‘fade’,
‘delay’ => 3,
‘duration’ => 1,
‘img_width’ => 300,<– change here width
‘img_height’ => 200,<– change here height
‘div’ => ‘rotator’
));

And edit code in style.css file of your theme:

#rotator{
border:20px solid #000;<– change here border color
}