Here are some stamped picks I made. I have played with these and show no wear after a few days playing. The one pick on the right was not stampled completely due to the rounded edges on the 2.0mm thick pick. I used StazOn stamping ink designed for plastics and a regular stamp. I really like these picks. The only surface prep I did was a quick light sanding with super fine sandpaper just in case but not sure if it is even necessary with this ink.

I added a second color to one of the picks and it worked out nicely. I guess I could have spent a little more time on this looking close up at it..LOL