This is not possible, as a single HTTP response can only send a single file. However, you can embed an image using the data:
URI scheme by creating an image similar to:
<img src = "data:image/png;base64,<data>" />
where <data>
is the image encoded as base-64.
Of course, you can always store the image and serve it in a separate request initiated by the browser when it comes across your image tag, especially for large images.