OK i am gonna teach you how to make one the first image into the second one.
The image you select will be alot easier to work with if you have a white background

to
Steps
1. Ok you can always make a couple extra duplicate layer just in case you mess up
2. Now go to the layer options and change the settings to colordodge (
i messed up in the screen shot but its colordodge)

You should now have something similar to this
3. Now press (Ctrl+I) To invert the image.
4. Now your gonna go to (Filter>Blur>Gaugasian Blur) and just mess aroudn wit it until you have a look you like.
5. Now we need the black and white look.
so go to the white/black circle thing and go to hue/saturation or colorize.
Set the saturation all the way down
Step 6. optional
If you ant some color like i did u can do this
Check colorize on the hue saturation box and just mess around with it
Then you can save it as .gif or .jpeg i recommend those.
striker recommends ".png has much better quality than .jpeg or .gif."
TUT by Token/Montage