Cross-stitching/Tapestry Effect - PSP7
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I use PSP7. I'd say it's translatable, although some people using PS had some trouble with colour increase and colour decrease features in my other tut.
1. Copy your base and paste it as a new Image.

2. Decrease colour depth in the new image to two colours, choose Grey Values, Ordered Dither and Weighted

3. Increase colour depth back to 64 million colours.
4. Create a new layer. Flood fill with light blue and set to Hard Light. (the choice of colour here is yours, but it must be a light tone, and the blues and the beiges seem to give the best final results)

5. Merge all layers and copy.
6. Paste as New Layer on top of your base, set to Luminance, and adjust the layer's transparency to your liking.

7. If the image is too light, merge all, duplicate and set to Multiply.
WARNING: Images with faces that are lighted from behind, and therefore don't have a lot of differently toned areas tend not to give good results with this techniques. With some you can solve the problem by using Red Values, or Green Values, or Blue Values instead of Grey values in step two, it's a matter of experimenting.
Here are some more icons using the same technique.
to 
I use PSP7. I'd say it's translatable, although some people using PS had some trouble with colour increase and colour decrease features in my other tut.
1. Copy your base and paste it as a new Image.

2. Decrease colour depth in the new image to two colours, choose Grey Values, Ordered Dither and Weighted

3. Increase colour depth back to 64 million colours.
4. Create a new layer. Flood fill with light blue and set to Hard Light. (the choice of colour here is yours, but it must be a light tone, and the blues and the beiges seem to give the best final results)

5. Merge all layers and copy.
6. Paste as New Layer on top of your base, set to Luminance, and adjust the layer's transparency to your liking.

7. If the image is too light, merge all, duplicate and set to Multiply.
WARNING: Images with faces that are lighted from behind, and therefore don't have a lot of differently toned areas tend not to give good results with this techniques. With some you can solve the problem by using Red Values, or Green Values, or Blue Values instead of Grey values in step two, it's a matter of experimenting.
Here are some more icons using the same technique.
