So we go
From
Original Icon by
Open your picture, sharpen it once (if necessary) and copy the base.
Set it to screen 80%
Now it should look like this
Copy the base again and set it on top and set it on Soft Light 100%
Now go Layer - New Adjustment Layer - Selective Color
and set it as follow
-Reds-
Cyan -100%
Magneta 0%
Yellow +100%
Black +100%
-Yellows-
Cyan -100%
Magneta 0%
Yellow +100%
Black 0%
-Neutrals-
Cyan +30%
Magneta +20%
Yellow +45%
Black +20%
Done? Than it should look like this:
Copy your base again, set it on top and set it to Soft Light 100%
Finish! ^^
Other icon with the same effect