Here is my third tutorial, using a cap from the third Torchwood episode, Ghost Machine.
Using Photoshop CS2, but is transferrable.
Step 1:
Crop image to 100x100 pixels
Step 2:
Duplicate the base twice. Set the first to screen and the second to soft light. I kept both of these at 100%, but you may wish to alter them depending on your base.
Step 3:
New colour fill layer (#0e3f69) Set to exclusion. Again I kept this at 100% but you may wish to change it.
Step 4:
Another new colour fill layer (#8ac0e5) Set to soft light 100%.
Step 5:
Merge all. Duplicate merged image and set to either overlay or softlight. For this particular icon I set it to overlay. If you set it to soft light you may wish to up the contrast a little.
And that's it! :D
Other examples of this colouring:
More examples can be found in
this post. Contains spoilers for Torchwood 103.
Hope this is helpful! Feedback is much appreciated and I'd love to see what you came up with! :D