Harvey Beaks is an American animated TV series created by C.H. Greenblatt, the creator of Chowder. Greenblatt created a test pilot for the show entitled Bad Seeds. Nickelodeon greenlit the show, and it was eventually renamed Harvey Beaks. In the pilot, Harvey had a dark blue shirt and no pants instead of having pants and a light green shirt, and Fee had a yellow dress instead of light green. The pilot currently cannot be found anywhere.
Findings
In 2015 someone on YouTube had uploaded the pilot episode though later Viacom took down the video. It was uploaded again by the same user on Vimeo, but deleted soon.
UPDATE 7-5-16 : An anonymous user claims to have contacted C.H. Greenblatt. He said from his info, C.H. Greenblatt has the only known copy of the pilot.
UPDATE 7-6-16 : I found online that Nickelodeon holds a copy in their library. People have been saying that it was C.H. Greenblatt's copy, but this was not confirmed.