Well, I got my certificate for completing my Astrobiology course. If the link doesn’t work, a b/w version follows here. (I can’t get the actual picture of the certificate to show up on the post but it does seem to come up if you click on “Astrobiology certificate.”) Believe me, it’s SO MUCH more impressive in color.
It would never serve as a credential for anything — nor should it. But I will hang it on my wall with pride.