gistfile1.js

( function( wp, $ ) {

	wp.customize.LayoutControl = wp.customize.Control.extend({
		ready: function() {
			var control = this,
				radios = $( '.radios', this.container ),
				selection = $( '.selection', this.container );

			radios.hide();
			$( '.layout[data-value="' + control.setting.get() + '"]', selection ).addClass( 'selected' );

			$( '.layout .icon', selection ).on( 'click', function( event ) {
				event.preventDefault();

				var layout = $( this ).closest( '.layout' );
				if ( layout.hasClass( 'selected' ) ) return;

				var container = layout.closest( '.customize-control-layout' );
				$( '.selection .layout', container ).removeClass( 'selected' );

				layout.addClass( 'selected' );

				control.setting.set( layout.data( 'value' ) );
			} );
		}
	});

	$.extend( wp.customize.controlConstructor, {
		'layout': wp.customize.LayoutControl,
	} );

} )( wp, jQuery );