2 tutorials
Both for PS (selective coloring + levels)
1) From this:
to this: 
1. Duplicate your base and set the copy to 'Screen'. Note: depending on your base, you can skip this step (if the original pic is light enough) or change the opacity.
2. Hue/Saturation layer: saturation +21
3. Selective Color Layer:
reds: 0; 0; 97; 0
yellows: +96; 0; 0; -68
cyans: +100; 0; -100; 0
blues: +100; 0; -100; 0
whites: +100; -46; -100; 0
neutrals: 0; 0; +16; 0
4. Levels layer:
green input levels: 0; 0,83; 241
blue input levels: 0; 0,76; 234
5. Color fill layer: #150303. Set on 'Exclusion'.
6. Add this gorgeous texture:
made by 
kiho_chan and set it to 'Lighten'.
You're done (:
Another icon made with the same technique:
2) From this:
to this: 
1. Repeat steps 2 - 5 from the tutorial above.
2. Add this beautiful texture:
made by vol4itca and set it to 'Lighten'
3. Then add this pretty texture:
made by nineteen07 and set it to 'Screen'.
And you're done (:
Another icon made with the same technique:
1) From this:
to this: 
1. Duplicate your base and set the copy to 'Screen'. Note: depending on your base, you can skip this step (if the original pic is light enough) or change the opacity.
2. Hue/Saturation layer: saturation +21
3. Selective Color Layer:
reds: 0; 0; 97; 0
yellows: +96; 0; 0; -68
cyans: +100; 0; -100; 0
blues: +100; 0; -100; 0
whites: +100; -46; -100; 0
neutrals: 0; 0; +16; 0
4. Levels layer:
green input levels: 0; 0,83; 241
blue input levels: 0; 0,76; 234
5. Color fill layer: #150303. Set on 'Exclusion'.
6. Add this gorgeous texture:
made by kiho_chan and set it to 'Lighten'.You're done (:
Another icon made with the same technique:
2) From this:
to this: 
1. Repeat steps 2 - 5 from the tutorial above.
2. Add this beautiful texture:
made by vol4itca and set it to 'Lighten'
3. Then add this pretty texture:
made by nineteen07 and set it to 'Screen'.And you're done (:
Another icon made with the same technique:
