If you want to remove "No Image Available" thumbnails, use this custom CSS code:

div.ecwid-noimage, div.ecwid-noimage-small {
display:none;
}

If you want to replace such images with your own ones, perform these steps:

• Create a new image
• Make sure your new icon is available on the Web. You can upload it to your web hosting or use image hosting like Flickr.
• Add the following custom CSS code to your custom theme: 

  div.ecwid-noimage {
    background-image:url('IMAGE_URL');
  }
  

  where IMAGE_URL is a path to your custom image
• Save changes and hit "reload" to see the changes in your shop. 
• If you want to replace such images on the cart page too, apply this code:

  div.ecwid-noimage-small {
    background-image:url('SMALL_IMAGE_URL');
  }

  where SMALL_IMAGE_URL is a path to your small custom image (80x80 px )

Examples.

The "no-image" picture with transparent background. You can use it if your page and store background is custom and isn't white. 

Apply this CSS code: 

div.ecwid-noimage {
  background-image:url(http://kb.ecwid.com/f/noimage_trans.png);
}

div.ecwid-noimage-small {
  background-image:url(http://kb.ecwid.com/f/noimage_small_trans.png);
}

If you created a custom image and want to share it with other Ecwid users, feel free contact us.