I was less than 10 years old when Ford became president. As sick as it sounds, whenever I think of Ford, the first image that pops into my mind is the back cover of a Mad Magazine (#172) from 1975:
Once I got a little older, it was Chevy Chase on SNL reruns that gave me another picture of Ford.
I honestly have no real first-hand memories of him as a president, while I have strong memories of both Nixon and Carter. Watching the coverage right now on MSNBC... I'm still not having any "oh yeah" moments - except that he was a member of the Warren Commission.