Data URI

<img src='data: ... '>

.bg {
  background: url('data: ... ');
}

<img src='data:image/svg+xml; ... '>

.bg {
  background: url('data:image/svg+xml; ... ');
}

<img src='data:image/svg+xml;utf8,<svg ... > ... </svg>'>

.bg {
  background: url('data:image/svg+xml;utf8,<svg ...> ... </svg>');
}

Data URIs

http://www.mobilefish.com/services/base64/base64.php

http://websemantics.co.uk/online_tools/image_to_data_uri_convertor/

http://jpillora.com/base64-encoder/