Here are some pipes I used on an old website, Brain Drain Graphics.

Wanna see how they connect? You can either right click and save the gif images, or right click and save the target, that'll save the psp files for them. You can put them together, using tables, maybe resize it and save as a gif for a background like this....

You could colorize them at full saturation -

Colorize and reduce saturation a bit -

Or just have the saturation at 0 to get a silver effect -