Just made a new repo on GitHub with Bootstrap Studio theme(s). I’ll be adding more but feel free to add your own by forking the project and making a pull request!
I started out with just the default Bootswatch theme to make it easier to make your own complete theme.
All the themes that you see on Bootswatch’s site https://bootswatch.com/default/ are included in BSS already so there are quite a few themes already set up.
Pretty much everything on the posters site are already in BSS as well. Browse around them, many of them have multiple pages that can be included already too.
You can access the themes in the settings of your project. I don’t think they work with the default templates, or at least some of them, but play around with them and you’ll see what they are. The Bootswatch site has a full preview of them all as well so you can see what they look like before you choose one.
Having said all that, I’d love to see some more full site templates with more styles of structure.