to make the button more transparent and less visible. To disable it, simply toggle off Assistive Touch in your settings.

you can even use the Clear Spaces transparent iPhone widgets to make custom home screen layouts compatible with complex wallpapers. After opening the app, you can tap the info button at the bottom ...

In iOS 8, you can set your home button to toggle your screen brightness level on your iPhone or iPad. This is another secret power of iOS's accessibility options that doesn't require jailbreak.