The package comes with the 20 full source PSD layered files of the icons, a big preview image of the icons,and also the icons in different sizes (128x128px, 256x256px and of course 512x512px). You could easily import them in Photoshop, change layers and colors and suit them for your own needs.
PSD + PNG | 22.9 Mb
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PSD Template – Social iPhone Icons Set