This web-app, compatible with iOS only (iPhone, iPad and iPod Touch), allows you to create shortcuts to your contacts on your home screen, and all of this without to jailbreak your device.

You'll only have to specify if you want to create a shortcut to a Facetime contact or a phone number, as well as the said number and the name of your contact, without forgetting the color of the created icon. You'll only have to tap this icon the next time you want to call or Facetime this contact!