This is tutorial for Photoshop users (it contains selective color)
We'll be going from
to 
1. We start with this base:
2. Duplicate the base twice. Set both copies to screen. The first one on 100% opacity and the second one on 72% opacity. (If your base is bright than one screen layer is enough)
RESULT:
3. New adjustment layer->selective color
REDS: -50, -15, +100, 0
YELLOWS: -100, 0, -100, 0
NEUTRALS: -15, -15, -10, -5
RESULT:
4. New adjustment layer->selective color
REDS: -100, 0, -50, 0
NEUTRALS: -30, 0, -10 ,+10
RESULT:
5. New adjustment layer->selective color
REDS: -50, 0, +40, 0
YELLOWS: -20, 0, +40, 0
NEUTRALS: +15, 0 , -10, 0
RESULT:
6. New adjustmen layer-> brightness/contrast
BRIGHTNESS: +12
CONTRAST: +10
RESULT:
7. New adjsutment layer->hue/saturation
SATURATION: +24
RESULT:
8. New adjustment layer->selective color
REDS: -40, +25, +100, +10
YELLOWS: +100, 0, -100, 0
NEUTRALS: +100, 0 , -20, 0
RESULT:
OTHER ICONS MADE WITH THIS TUTORIAL:

We'll be going from
to 
1. We start with this base:

2. Duplicate the base twice. Set both copies to screen. The first one on 100% opacity and the second one on 72% opacity. (If your base is bright than one screen layer is enough)
RESULT:

3. New adjustment layer->selective color
REDS: -50, -15, +100, 0
YELLOWS: -100, 0, -100, 0
NEUTRALS: -15, -15, -10, -5
RESULT:

4. New adjustment layer->selective color
REDS: -100, 0, -50, 0
NEUTRALS: -30, 0, -10 ,+10
RESULT:

5. New adjustment layer->selective color
REDS: -50, 0, +40, 0
YELLOWS: -20, 0, +40, 0
NEUTRALS: +15, 0 , -10, 0
RESULT:

6. New adjustmen layer-> brightness/contrast
BRIGHTNESS: +12
CONTRAST: +10
RESULT:

7. New adjsutment layer->hue/saturation
SATURATION: +24
RESULT:

8. New adjustment layer->selective color
REDS: -40, +25, +100, +10
YELLOWS: +100, 0, -100, 0
NEUTRALS: +100, 0 , -20, 0
RESULT:

OTHER ICONS MADE WITH THIS TUTORIAL:

