I'm not sure if you've figured this out, but you can change the folder colors to anything you want. Just click on your folder and tap the little circle to customize.
I'm using mostly widgets on my screens and taking advantage of the edge panel for my most used app icons. Then I have folders in the app tray to easily access other apps I use a lot. It keeps my pages a little less cluttered. I'm liking it so far!
It seems I should be able to tap one of the screen inductors at the bottom of the page and go directly to that specific panel. But mine just scrolls over one panel at a time no matter which dot I tap. Is it supposed to be like that?