Seeing as we are approaching the 50th anniversary, I thought the theme of this contest should be the very early days. Basically, anything from William Hartnell's 3-year run, from "An Unearthly Child" through "The Tenth Planet". 150x150, 140kb, etc. Allons-y!
^ I wanted to enter something from a first Doctor story I'd actually seen rather than a random image off a google search, and 'Planet of Giants' was shown at the Alamo Drafthouse this past summer...