Thanks for making the issue! I guess it makes sense to make a PR for the CSS file of the winning theme, so we could add it to this repo.
EDIT: Is that how it works, you give me the CSS and I put it in the channel config and it's done?
I think a separate folder in this repo would be enough. So it looks like everyone likes the first one a bit more (with few exceptions). Should we make it the default one already, or do you want to experiment a bit more?