Paradign Research Logo
In 1994 I was working at a small company I helped found. We had a logo designed by a graphic artist, but I didn't have a copy of that logo. This didn't matter until we ran into a problem at the printer and I was the only person that could solve the problem. So since I didn't have a paint program that I knew how to use well, I did what any crazy person would do, I wrote the logo in Postscript.
The fancy version has a gradient:
While the less fancy version is flat: