Change background color by column

1) I would like to suggest having an option to have a sidebar for the generation 3 templates. This would make it easier to organize newsletter.

2) I would also love to edit the rows a little more. For example, being able to change the color of one section and having a different color for the other section. 

3) Having a vertical divider would also be helpful in distinguishing between 2 sections within the same row