First tutorial

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1. Crop your image.

2. Go to layer> new adjustment layer> curves

RGB
Point one: 100/93
Point two: 149/151

Red
Point one: 129/124

Green
Point one: 102/95
Point two: 141/145

Blue
Point one: 108/91
Point two: 147/149

3. Again layer> new adjustment layer> curves

RGB
Point one: 119/131
Point two: 142/161

Blue
Point one: 123/133
Point two: 136/154

4. Layer> new adjustment layer> levels

RGB 28/0,92/255

5. Layer> new adjustment layer> mix channel (sorry if it has different name, just i have russian version of Photoshop)

Red: 149/-73/-2/-2
Green: -20/116/2
Blue: 0/0/108

6. Layer> new adjustment layer> hue/saturation

Increase Master saturation as much as you want. I have +9.

That is all!

Another icons made with this tutorial: