Rachel Bilson, yay!
This tutorial is for getting the yellow/green effect in icons.
Going from
to
1) Open up your ready base. Crop, etc. Screen the image if needed.
2) Layer>New Adjustment Layer>Selective Colour
Reds: -100 | 22 | 100 | -29
Yellows: -63 | 22 | 100 | -20
Neutrals: 20 | -6 | 19 | -12
-set to 80% opacity.
3) Layer>New Adjustment Layer>Hue/Saturation
Master
S: 26
L: 3
Yellows
S: 6
L: 7
4) Layer>New Adjustment Layer>Curves
Channel: BLUE
I: 97
O: 12
(this is going to be right at the bottom)
5) And you're done!
Add a text, texture, fancy something else and you've got an awesome yellow/green icon!
**note that all images are different.
Not everything will turn out the same, especially depending on the source, quality and what is in the image.
The above tutorial is recommended to be altered to suit your specific image**
other examples: