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
Recent comments
Glad it works for you! Regarding selecting options, I've just tested the Views Autocomplete Filters module and got it working after I had a look at the README and made sure to use the same...
Can't filter content in a View
You are right, that was it... Now my problem is I would like users being able to select from pre-established options, like a drop down or maybe an autocomplete. For that I would the Autocomplete...
Can't filter content in a View
Here goes the screenshot for the exposed filter config I will try the module you are telling me about. thanks again!
Can't filter content in a View