The jailbreak tweak CallShortcut brings quick access to contacts directly to the home screen. With just one tap on a home screen icon iOS will start dialing the associated contact. Calling icons will be generated using the photos set in Contacts.
Setting up home screen shortcuts for contacts is straightforward. Once installed, CallShortcut adds a new option to the Contacts app. While viewing any contact, scroll to the bottom of the page and tap Add to Home Screen, right under Add to Favorites.
All of the contacts that are added to the home screen in this manner will appear as icons, just like apps. Not only does this make convenient shortcuts for quick calls, but the icons can be organized into folders just like normal. Although it means an extra tap to open the folder, all of the shortcuts can be kept in one place on the home screen. There are no additional settings to configure.
CallShortcut is available from the BigBoss repository on Cydia for free. Jailbreak iOS 7.1.x with Pangu to start customizing iOS. Check here for instructions on how to jailbreak iOS 7.0.x with evasi0n 7. You can also find out how to purchase and install Cydia tweaks with this guide.