You Can Still Get Circular Folders
A few weeks back iOS 9 users discovered a bug that's more like a feature. This "feature" allows you to turn your rectangular folders into circular ones in just a few steps and without the need for an iOS 9 jailbreak. And yes, it's still active in the iOS 9.3.5 update.
If you're interested, here's how you acquire circular looking folders on your iPhone 6. Note that this only works with user-created folders.
First, you need a 3 x 3 pixel background. Head to that link, choose a color you like and save it to your Camera Roll.
After that's done head to Settings > Wallpaper > Choose a New Wallpaper. From there, select Camera Roll/My Photo Stream and select the wallpaper you just saved to your iPhone 6. Apply the new wallpaper to your Home Screen.
Go back to your home screen and voila, you'll notice circular folders. It's a neat little touch. At this point, it's not clear if Apple will patch this feature/bug up with a future update.
As an Amazon Associate I earn from qualifying purchases.