From This:
to this:
Made in Photoshop CS2
No curves, just color layers
1 Layer Duplicate the base, and set it to screen, opacity 100%
2 Layer Duplicate the base, and set it to screen, opacity 50%
3 Layer Duplicate the base, and set it to overlay, opacity 100%
4 Layer New Layer 001150, Exclusion 100%.
5 Layer New Layer ffe49c, Multiply 100%.
6 Layer New Layer 9ce9ff, Soft Light 100%.
7 Layer New Layer d29cff, Soft Light 100%
8 Layer New Layer ffeac8, Multiply 100%
9 Layer New Layer c8efff, Color Burn 100%
10 Layer Duplicate the base, and set it to soft light, opacity 100%. Drag it to the top.
And your done!
other icons done on the basis of this tutorial