This is the first of a new set of textures designed for Steampunk vessels, and will be followed up by sets of wall textures for engine rooms and for living quarters (you can catch a glimpse of one these in the sample picture below).
There are 40 textures in all, at 256×256 size. They tile seamlessly, although they are really intended to be used on single panels (as will probably be obvious).
The set isn’t available in Inworldz yet, but probably will be later today. See the update below.
For Second Life, you can pick up a copy at the Second Life Marketplace, or in-world at the main store (you’ll find it on the second floor).
Update: The set is now available in Inworldz, in the Templar Creations Main Store at Tulare 134/220/22.