4. Memphis / Steampunk
Memphis
Memphis
Here's a vid that explains more about the Memphis Style movement.
Memphis_ResourcePack, big pdf.pdf
Download this Memphis Resource Pack and read about this style of design. The most relevant pages for us are pages 3 to 14 in this article.
Steampunk
Steampunk
A vid about what steampunk is.
Here is an article that describes some of how steampunk works and gets into materials as well.