This build-your-own iPhone icon kit comes complete with 20 sample vector icons and various backgrounds for hundreds of possible combinations. Using vector shape layers for easy customization, and Smart Objects for automatic updating of icon sizes, this kit makes it a breeze to create your own high quality quality, gorgeous iPhone, iPad and iOS 7 application icons. - medialoot
This kit uses Smart Objects in Photoshop to automatically generate all iOS size app icons, it also includes a grid overlay for aligning your artwork and an Action preset to export your icons when you’re done.
Whatever your use, we hope you enjoy it.