Going from THIS to
Cap made by me.
Open up you screencap. I'll be using THIS cap of Paige Matthews from Charmed.
I cropped it to 478x478 just to make a smaller pallate. It works best if you use a large base to start.
Duplicate your base and set layer to SCREEN / OPACITY 100 (sometimes i need to duplicate the base twice and have two screen layers)
Add a new layer. Set this layer to BURN / OPACITY 100. Fill with #9cd9ff.
Add a new layer. Set this layer to SOFT LIGHT / OPACITY 100. Fill with #fbe8d4.
Add a new layer. Set this layer to BURN / OPACITY 100. Fill with #fbe8d4.
Go to EDIT >> COPY MERGED. Then paste this as a new layer. Go to Hue/Saturation/Lightness and set SATURATION to 50. Leave hue and lightness alone.
Looks pretty funky doesn't it? Not for long set this layer to SOFT LIGHT / 100 OPACITY.
Resize to 100x100.
ADJUST >> SHARPNESS >> UNSHARP MASK
& make sure luminance only is UNCHECKED.
Your done. =]
Keep in mind that depending on your base your icon will turn out different and may require different settings. I've also only tried it on Charmed and House caps so far.