Use a font instead of an image. There are (lots of) fonts with (lots of) ornaments. If you're very picky about which particular image to use, I think there are tools that can convert an image into a font. You'll probably be limited to monochrome, no partial opacity images.
Or if you use an SVG image, I believe you can leave one of the colors unspecified and it will use the current text color. However, I'm not sure if this is actually part of the spec, or if it's easily done with any image editor software (SVG files are text, you could always edit the text), or if ebook readers will actually support it.
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