Hi !
I love the templates that are suggested when creating a new app, and I hope there are more to come to reduce "boilerplate" drag and drop even further.
However, I could not find an easy way to get the styling back to my org's default theme other than resetting the styles on each component.
I think adding a way to either unstyle the templated apps, style the templated apps with one of the themes or offering the option to reset all styles on a selection of components would be a good idea.
pjmv