1. make a new document i used 400x100
2. download some abstract brushes if you haevn't already i've uploaded my favorite set if you want to use them
http://download.mercury.come2store.com/ola...tract_pack1.abr3. fill your background with black and make a new layer
4. press d to reset your colors and then press x
5. on the new layer start brushing with different abstract brushes till you get something that looks cool, heres what i got

6. press d and make a new layer above your brush layer
.
7. go filter -> render clouds and change the blending mode to color
8. go to layer -> layer style and click the gradient overlay box(so it has a tick)
your settings should look like this

9. click the gradient bar so a menu comes up looking like the following

10. now simply pick 2 colors of your choice(choosing a color for the small box on the bottom left of the bar and another color for the bottom right)
11. press ok till you get back to your sig
12. add text/characters/borders/whatever and your done
heres what i got from this tutorial