I have been working to make a custom catalogue, to try out the new feature.
Anyone who is interested in trying this out is welcome to try linking their Rancher to the following catalogue URL:
https://github.com/sshipway/rancher-catalogue.git (British spelling!)
Obviously, all caveats apply. I’d be interested in seeing any other catalogues created by other people, as well; please post URLs here if you have anything you think may be of interest to the community.