Gun artwork is very popular in some circles. An Etsy page is now selling gun patent drawings as posters. Pricing starts at $6.99 for a 5×7 and goes up to $34.99 for a 24×36. Some of the patent art being sold include the M1 Garand, Gatling Gun and Glock pistol.
The same Etsy shop owner also sells patent art for non-firearm things such as the P-38, the Gibson Les Paul guitar and a beer keg cooler.