I made these little wood inlay save icon pins as gifts for April birthdays.
I traced a photo of a 3.5″ floppy disk in Inkscape, scaled it to 1″ (~24mm) square, then separated the pieces and kerf corrected them. I laser cut and engraved the pieces from 3mm thick walnut and oak. I assembled the pieces with wood glue, gave it a light sanding, then finished with wipe-on polyurethane (three coats, with a very light sanding between coats and at the end). The tack backing is attached with construction adhesive.
After consulting with a friend who wears a lot of pins, I got a collection of backings, including the traditional butterfly backs, rubber backs (softer and less irritating for skin contact), and locking backs (to reduce chance of loss).
There is a 2-minute making-of video:
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