Here is an example of widget areas that know how many widgets are in them. For example, if you put two widgets in the widget area they each get a width of half. Credits: Junior Atoms / Larry http://cobaltapps.com/forum/forum/dynamik-skin-forums/tools-tips-other-skin-resources-aa/45619-widget-aware-widget-areas

widget_aware_widget_areas.php

//* Count the number of widgets in a widget-area
function dynamik_count_sidebar_widgets( $sidebar_id ) {
    
    $the_widgets = wp_get_sidebars_widgets();
    
    if( isset( $the_widgets[$sidebar_id] ) ) {
        return count( $the_widgets[$sidebar_id] );
    }
}

//* Add markup for the after ez home widget areas
add_action( 'dynamik_hook_after_ez_home', 'dynamik_after_ez_home_widgets' );
function dynamik_after_ez_home_widgets() {

    genesis_widget_area( 'after-ez-home-1', array(
        'before' => '<div id="after-ez-home-1" class="widget-count-' . dynamik_count_sidebar_widgets( 'after-ez-home-1' ) . ' clearfix"><div class="ez-widget-area clearfix">',
        'after'  => '</div></div>',
    ) );

    genesis_widget_area( 'after-ez-home-2', array(
        'before' => '<div id="after-ez-home-2" class="widget-count-' . dynamik_count_sidebar_widgets( 'after-ez-home-2' ) . ' clearfix"><div class="ez-widget-area clearfix">',
        'after'  => '</div></div>',
    ) );

    genesis_widget_area( 'after-ez-home-3', array(
        'before' => '<div id="after-ez-home-3" class="widget-count-' . dynamik_count_sidebar_widgets( 'after-ez-home-3' ) . ' clearfix"><div class="ez-widget-area clearfix">',
        'after'  => '</div></div>',
    ) );

    genesis_widget_area( 'after-ez-home-4', array(
        'before' => '<div id="after-ez-home-4" class="widget-count-' . dynamik_count_sidebar_widgets( 'after-ez-home-4' ) . ' clearfix"><div class="ez-widget-area clearfix">',
        'after'  => '</div></div>',
    ) );

}
    
//* Register after ez home widget areas
genesis_register_sidebar( array(
    'id'          => 'after-ez-home-1',
    'name'        => __( 'After EZ Home #1', 'dynamik-gen' ),
) );
genesis_register_sidebar( array(
    'id'          => 'after-ez-home-2',
    'name'        => __( 'After EZ Home #2', 'dynamik-gen' ),
) );
genesis_register_sidebar( array(
    'id'          => 'after-ez-home-3',
    'name'        => __( 'After EZ Home #3', 'dynamik-gen' ),
) );
genesis_register_sidebar( array(
    'id'          => 'after-ez-home-4',
    'name'        => __( 'After EZ Home #4', 'dynamik-gen' ),
) );  

widget_aware_widget_areas_css.css

/* Widget Counts */

.widget-count-2 .widget,
.widget-count-3 .widget,
.widget-count-4 .widget,
.widget-count-5 .widget,
.widget-count-6 .widget {
    float: left;
    margin-left: 2.564102564102564%;
    margin-bottom: 20px;
}

.widget-count-2 .widget:first-child,
.widget-count-3 .widget:first-child,
.widget-count-4 .widget:first-child,
.widget-count-5 .widget:first-child,
.widget-count-6 .widget:first-child {
    clear: both;
    margin-left: 0;
}

.widget-count-2 .widget {
    width: 48.717948717948715%;
}

.widget-count-3 .widget {
    width: 31.623931623931625%;
}

.widget-count-4 .widget {
    width: 23.076923076923077%;
}

.widget-count-5 .widget {
    width: 17.9487179487179488%;
}

.widget-count-6 .widget {
    width: 14.52991452991453%;
}

@media only screen and (max-width: 1140px) {

    .widget-count-2 .widget,
    .widget-count-3 .widget,
    .widget-count-4 .widget,
    .widget-count-5 .widget,
    .widget-count-6 .widget {
        clear: both;
        margin-left: 0;
        width: 100%;
    }
    
}