Luckily, you CAN switch back to the Minima/Minima Stretch templates, Blogger has just made it tricky to do, unless you know exactly where to look.
- First you need to get to your Layout Page/Page Elements Page by clicking on "design".
- Now, look up to the left where it says "Edit Html", click on that and it should take you to the "Backup / Restore Template" page.
- Scroll down to the bottom of the page and you'll see "Layout Templates (Launched 2006)", click on "Select Layout Template" and it will take you to the old layouts.
- Pick Minima, or Minima Stretch. You could also pick Minima Lefty or Minima Lefty Stretch.
I hope this helps! I plan on posting more tutorials soon. If you need any more help feel free to leave a comment, or contact me at firstname.lastname@example.org.