I used FIMO and one original plastic record to imprint the lines into them. Then just added some green paper in the middle. That pen tip is for making the hole.
The funny part is, I should have baked them properly to harden the FIMO but was impatient so just used hot water, thinking it would be enough. Turned out that they stiffened but still easily broke by themselves when I was picking them up. But since that was what I wanted anyway I didn't complain ;)