One of my favourite 'Dead Technologies' medium is the sadly-departed Floppy Disk. Disks provide challenging surfaces to paint and decorate, whether they be the earlier large 5 1/4" Floppies (that were truly floppy) or the smaller, later and rigid 3 1/2" Floppies.
Mr. Wick Ed Pedia has this to say about them: "Floppy disks slowly lost popularity as better technology developed which was able to offer higher levels of storage capacity, smaller physical characteristics, and faster processing speeds. While floppy disk drives still have some limited uses, especially with legacy industrial computer equipment, they have been superseded by data storage methods with much greater capacity, such as USB flash drives, portable external hard disk drives, optical discs, memory cards, and computer networks."
I'm more interested in turning them into an art form. Here are some examples of my Floppy Disk Art.