Icon Colouring!

Step 1

Result:

First
start to "screen" the image you're using. In this tutorial I
duplicate my image twice on screen (second duplicate on 30%).
But this totally depends on the darkness of the image you're
using.

Step 2

Result:

Next
add these following curve layers:

 

Red: input: 213 | output: 203

Red: input: 24 | output: 41

Green: input: 179 | output: 200

Green: input: 61 | output: 35

Blue: input: 217 | output: 203

Blue:
input: 69 | output: 55

Step 3

Result:

Next
add a "soft light" layer 100% filled with colour: #CFCFB3

Step 4

Result:

Next
add an "exclusion" layer 100% filled with colour: #211603

Step 5

Result:

Than
add an "burn" layer about 30% filled with colour: #1F4569

Step 6

Result:

And
last but not least ^^

Brightness: 0 | Contrast: +10

Some other examples: