I've been looking for some *.PSD mockups online and since I haven't found anything that suits my needs, I've done it myself.
- 6 column iPhone 6 grid layout with 105px column and 10px gutter each.
- 10 column iPhone 6 grid layout with 55px column and 10px gutter each.
Set 25 px / 5 grid in your Photoshop preferences to get 5px minimum standard unit, to get more power over your design.
Feel free to download it, share and get inspired.