Hello @Davidp9. When you were brought over to our new upgraded experience, we did eliminate some outdated templates from the template picker as we are moving towards more mobile-responsive layouts. If you did use this template in the past for previously sent campaigns, you can still make a copy of it and use it to create your new campaign. Our newer templates are very customizable so feel free to use these and insert your own content!
All of our templates are fully customizable. So while we do not have a nature template currently if you have your own inspirational or nature images and content they could be incorporated into any of our templates.
Additionally, if you know HTML you could build your own template in our Custom Code Advanced Editor.
I will make sure to let our product teams know you would like a broader selection of templates.