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This tutorial shows you how to create simple chrome pipes which can be used to spice up an interface and give your images a technical or scary look.
Create a new white image. This image is 200*20 pixels.
Set the background color to black.
Erase every second column using <Image> -> Script-Fu -> Alchemy -> Erase every other row. Optimal settings are show here.
Your result should look like this.
Now, create a new layer above the first one. Doubleclick on the gradient fill tool button and set its options like shown here (bilinear gradient is important!).
Use the gradient fill tool to create a gradient like this. Play with its position. Best results can be achieved when setting the starting point (white) at 1/3 of the image and the ending point (black) to image's bottom.
Set the gradient layer's mode to "multiply".
That's all!
To make the pipe look more naturally or scary use the airbrush tool to add details like blood spots and/or shades.