Provide additional responsive theme similar to the legacy themes

You've provided us with pre-built legacy themes in the prior and current versions of K2. I'm aware style configurator has been added to change the colors. This is okay but we would also like the option of additional modern/responsive themes we can select from instead of just being limited to what is offered by the style config options. Can we get more theme selections? Blue and Grey Void are okay. There's an opportunity to provide more prebuilt themes from which to select. I find that the prebuilt themes are more responsive than the styles as the forms using styles take longer to load subview/forms compared to legacy themes.