Using this DIY hack you can attach any SLR lens to your iPhone4, and have it mimic the wonderful quality of a vintage ‘Lomo‘ camera.
It’ll add great depth-of-field and vignetting to your iPhone photographs (although, admittedly, it won’t fit in your pocket anymore).
Why buy something when you can make it yourself?
Link: ‘LOMO like pictures by iPhone 4‘
are there steps anywhere on how to make this?
No, I’m afraid not. Maybe you can try contacting the designer?