Users who use "3D Touch" to access the menus of application icons on the home screen, a priori know their utility to reach specific actions of the applications. On the other hand, all the 3D Touch menus on the home screen are quite dull and no matter what application the 3D touch gesture uses, the menu is always the same color. For now you can change the background color of the 3D Touch menu of the icons with Cuttlefish.
This new jailbreak tweak aims to change the dynamics of focus background color to match the dominant color of the icon of the application that is using the 3D menu touch gesture.
The tweak does not color the menu itself, but colors the background blur, which appears after the menu. This makes even the menu appear colored.
You can see in the image above that the use of 3D Touch in the App Store produces a defocused background that acquires a blue tone, while the iBooks application produces a yellowish coloration and the news application produces a red tone by drawing pink.
Since the colors used are the application icons' key colors, the out-of-focus and colored backgrounds actually make the icons stand out against any background you're using.
Even devices that do not have 3D Touch, and iPads, iPod touch, and iPhone older models can use a jailbreak tweak as Forcy or RevealMenu to simulate a 3D touch gesture on the home screen. Cuttlefish works great with this type of tweaks, so anyone with a jailbreak can use Cuttlefish, whether they have a 3D touch screen or not.
The features of Cuttlefish would be a great aesthetic for Apple to adopt in a future version of iOS, but for now you can get this tweak on your iOS 9 or iOS 10 jailbreak device for free from the Cydia BigBoss repository.