This could be an easy win, because besides offering something "trendy", we would also have an example in core of how subtheming works.
It may be so that this could even be as simple as implementing Color module support for Seven, and then making it a color scheme that people can select and tweak.
Related: https://github.com/backdrop/backdrop-issues/issues/4778
GitHub Issue #:
3990
Recent comments
Have you looked at the Wordpress import module?
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