The Steampunk movement is all about packaging gadgets and art pieces in a way that reminds you of a bygone era, yet would have some sort of futuristic flavor that enhances the look and feel of any techy or fashion device.
Here is the Project Kain, which is a Steampunk Final Fantasy IV case mod, and it sure looks awesome. Final Fantasy is one of the longest surviving games, and Final Fantasy IV was released way back in 1991 as part of the series.
The game follows the story of Cecil who prevents the evil Golbez from destroying the world using witchcraft. This casemod here has that Steampunk feel to it, while bringing back the memories of Final Fantasy IV. Perhaps, the idea was to project the game in a Steampunk fashion as Final Fantasy itself is 2 decades old now.
This Steampunk casemod surely would be one of the coolest things to have if you are a Final Fantasy fan, and perhaps you could try building one too! You could also check out other cool casemods like the God of War Casemod, District 9 Casemod, and the Egyptian Casemod which transports you back to the era of pharaohs and pyramids.