I decided to resurrect my old D-Power digivice and turn it into a D-Arc, using the casing shell and buttons from a bootleg digivice: [link]
(Edit: OK, maybe not the casing. It's too small for me to use, but the strap and the buttons almost work nicely)
Since I don't have a realistic-looking blue card (I have one that looks realistic on one side, but has digimon junk on the other), I decided to make a floppy disk label for a "blue card disk", but that would mean I would have to have access to the symbol for the blue card, which I can get, but would look crappy if I attempted to cut and paste either from a recorded TV broadcast/picture, or from the blue card I used with my D-Power; so I decided to make the symbol myself all over again. All I had to do was look at the details on the symbol (like how many dots make up each horizontal line of the "D", and how many rows of those dots are there?), although I had trouble trying to position the digital/pixelated dinosaur/digimon image so it would match a reference image I was able to grab.
I think it looks OK, although I wish that I could have been able to match that pixelated dinosaur/digimon up with the real thing.
Edit: (made it slightly more accurate to the real thing)
Edit: I've decided to make a real-life replica of a blue card using a an old circuit board (If I can find a blue one), a piece of metal, and a rub-off transfer of this symbol), hopefully I can find everything I need.
Thanks again.