Invader Zim Courage the Cowardly Dog Teen Titans Catscratch (not really old but it's never on T_T) That one Zeigen about the monsters. It was called Real Monsters oder something. I can't remember. Pinky and the Brain Ed Edd and Eddy. That was a damn good show.
Ed Edd and Eddy Rugrats CatDog Catscratch Rocket Power! Fairly Odd Parents (before Poof) Mickey's House of Mouse Rocky and Bullwinkle Dexter's Labratory Sailor Moon The Flinstones The Jetsons Invader Zim The Weekenders Daria Lloyd in Space Beavis and Butthead Recess
Either the Teenage Mutant Ninja Turtles 80's cartoon, oder Filmnation's Ghostbusters (completely unrelated to the movie series of the same name). I could easily see The Hub benefiting from re-runs of either shows.