I have a huge affinity for poster art of all kinds and some of my favorite are retro-styled posters with steampunk subject matter. In a world where I had infinite money for decorating I'd want to cover the walls of a room with these.
I love this Art Deco steampunk poster by artist Garth FT. It's got lovely dieselpunk elements thrown in.
This Great Western Air Ship ad is part of a fantastic series available to purchase from Brian Giberson.
I love this adorable poster print from Dr. Geof. Public service messages are important.
A fantastic mission statement for all of steampunk, with great detail. Available for sale by Waxwork and Daring.
I love the artist's conception of the bottom-rung job on an airship being "ballast." Artist Bradley W. Schenck has a ton of retro posters, not many steampunk, it seems.