title: Get URL of variation image thumbnails in WooCommerce
body: <p>I'm using the following code to grab the image of every variation for a particular product:</p>
  
  <pre><code>$product = new WC_Product_Variable( $product_id );
  $variations = $product-&gt;get_available_variations();
  
  foreach ( $variations as $variation ) {
    echo "&lt;img src=" . $variation['image']['url'] ."&gt;";
  }
  </code></pre>
  
  <p>This returns the full size image.</p>
  
  <p><strong>Can anyone tell me how I would modify this to return the 'thumbnail' URL?</strong> (or any other size)</p>
  
  <p>I'm sure it's a fairly simple change but I just can't figure it out.</p>