We will be making this:
1. First make a new document in photoshop (300x300).
2. Pull out the gradient tool, and using the preset from whit to black, make a dark background:
3. Now take out your pen tool. Set it up like this:
4. Make some designs on your image with the pen tool, these are where the pipes will go:
5. Now get out your brush tool, and set it up as follows:
6. Go back to your pen tool, and then go into the paths panel (click paths in your layers manager) and click your path, then right click your image. Click stroke path:
Select your path
Be sure your in a new layer, Right click and press stroke path. Select your brush tool in the drop down menu.
7. Go into the blending options for this layer, and set it up as follows:
Drop Shadow
Inner Shadow
Bevel and Emboss
8. Create a new document, 300x300. Select a light brown as your foreground color, and then go to filter > Render > Clouds:
9. Paste this image over your wire layer in your first document, and set the blending mode to Color Dodge:
And that's it!
Good Luck!
More Tutorials: 
