Those pixel Trek characters came from Something Awful's Photoshop Pfriday a few weeks back:
This is part 2...but the first page has a link to part 1. Also...the last page has the key to tell you what each picture is. Some are very tough.
Thanks for that! Unfortunately, that also shows that it doesn't always come out good. Some of them just looked like I was looking at a horizontally blurred picture, and weren't really properly done.