Freebbble!

This looks very cool. Reminds me of Photoshop tutorials back in the day, they used to teach us things like this.

Shards Fragments iPhone 5 Wallpaper is a free Wallpaper design resource made by Dribbble user Alex Huang. As far as I can tell, its license is Unknown.

Helpful hint: Dribbble users are nice. If the license is unknown, it is usually because they forgot to mention it explicitly; not because they were being stingy. Ask nicely and they will probably allow you to use it.