1) First things first, we're going to do a basic thing of creating a new file. The size should be 500x150 pixels.
Once you've finished that step, you're going to fill the file with any background color.
(The color doesn't matter at all - it can be any color)
2) Now, you'll need to find an image of a space or a universe.
You can find one on wallbase.cc by searching for universe (or space).
However, if you are too lazy to do that, you can download a universe gallery from here.
Click Here
3) So, when you have the background of your space / universe that you are going to use, drag it into photoshop under your main layer.
4) Great, now right click on the image that you have dragged into PS, and choose “Create Clipping Mask” after that you want to select both layers and click 'Merge Layers'.
5) Great job! Now, it’s time to add some text to our signature. But before we get onto that, we'll change the color of it. To change color of it, first create a new layer. After a new layer has been created you'll want to fill it with the color you want to use, we'll use a light blue for this tutorial. Once you’ve done that, you want to change layer style from Normal to Darken / or Hue, whatever floats your boat.
6) Good job! There are only just a few more things we've got to do. Place your text wherever you want and double click on text layer, to open Blending Tools. Keep the blend mode on Normal and put the Opacity to about %75 and the size to %7.
Click Here for an example.
7) Now select all of the layers and then merge them (select them all, right click 'merge layers'). After that, you will have to go to Image > Canvas Size and put 600x200 pixels and press OK.
Click Here for an example.
8) This bit can be a little confusing so here's a video on how to do it:
[video=youtube]
www.youtube.com/watch?v=4mBF_hXZUJg&feature=player_embedded[/video]
NOTE: I did not come up with this tutorial, I just figured that since there are alot of people asking for sigs I would post this