Gerald from "Hey Arnold":
Tulio and Miguel from "The Road to El Dorado":
Plank from "Ed, Edd, and Eddy":
Krum from "Aaaah!! Real Monsters":
Artie, the strongest man in the world, from "Pete & Pete":
Skeeter from "Doug":
Mrs. Nesbitt from "Toy Story":
The Pixar lamp:
REPAIR MAN-MAN-MAN-MAN-MAN from "All That":
The Ski-Free monster:
Fluffy the three-headed dog from "Harry Potter":
Wilson from "Home Improvement":
The Big Head Mode cheat in "Goldeneye 64":
Bananas In Pajamas:
Urkel:
The leg lamp from "A Christmas Story":
Jimmy Neutron's mom:
Powdered Toast Man from "Ren & Stimpy":
A LEGO man:
A champion on "Guts":
Reptar from "Rugrats":
Oblina from "Aaah!! Real Monsters":
Robbie from "Dinosaurs":
A Tomagatchi:
Daria and Jane from "Daria":
Stick Stickley:
And, the scariest thing of all, The "Are You Afraid of the Dark" opening credits:
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Looks to me like it's just a photo of the original character next to a photo of some celebrity that I don't know.