Obscure nicktoons shorts

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Here are a thing I've heard absolutely no one talk about. There were these shorts that people submitted to Nickelodeon to be played on nicktoons. I was little at the time but I clearly remember commercials saying that you could make your own animations and send it. It was around 2005- 2008 it seems. I remember them showing the video "Kenya" by Weebl, and another animation of a creepy spider woman. Does anyone have more info?