This one will probably only appeal to a certain crowd. It's a very...unique looking sig, check it out:
1. Start by making a new document (400x160) Transparent Background
2. Fill the Document with red:

3. Now using your lasso tool, go crazy on the canvas, just draw left and right, until you get something like this:

4. Now fill that with Black, using the "Paint Bucket Tool"

5. Now grab the Lasso Tool again, and once more, go crazy with it. Then fill that one with hot pink.

6. Now do it again, this time with a darker purple.

7. Once again, with a dark red this time:

8. and finally, do it again this time with black.

9. "Filter > Brush Strokes > Ink Outlines" (Stroke Length: 50 | Dark Intensity: 0 | Light Intensity: 30)

10. Now once again, like i've done in previous tutorials, it's time for a nice border. open your Blending Options, and use these settings:
Inner Shadow:

Inner Glow:

Gradient Overlay:

Stroke:

Press okay.
Now it's time to add the 1 pixel texture (Shown how to make at the end of tutorial)

And you're done! :D let me know how you like it.
[Note: It can also be done with different colors.]
-KnoX[/color]
Texture Tutorial
:1. New Document 3x3 pixels.
Take your Pencil tool, and with black selected, place a dot, right in the middle of the canvas.

2. "Edit > Define Pattern" give it a name, and your done.
(To use this pattern, simply go to the layer you want it on, go: "Edit > Fill" with these settings:)
And that should do it!
-Scott