All the dice are made from thick cardboard. Scored, cut, glued and then covered in something. I used elmer's glue to hold everything together.
The d6 is covered in rice and I used buttons for the dots.
The d8 is covered in pieces of napkin that I ripped up, balled up and then glued to the surface.
The d4 is covered with strips of masking tape and then I gave the whole thing a coat of brown shoe polish.
The d20 is just glued together. There's nothing covering it. Man, that was a pain to glue together.