Texture of 3D pipes with transparency.
I also included a PDF tutorial on how to create similar textures (I used Photoshop CS4 but they could easily be converted to other software packages)
Comments
This is the most useless OGA contribution I've seen yet. Even the most clueless, complete non-artist can generate something like this in the gimp in all of five minutes - and in fact, would be more likely to just use untextured, or procedurally-textured geometry instead, given how primitive these are.