http://www.toonboom.com/img/products/studio/img_pixelBoy.jpg
http://www.toonboom.com/img/products/studio/img_peteKawa.jpg
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Hi,
If you look at it closely, you will see these are just gradients. Well done but only gradients.
I know the Lolly pop one author creates the artwork in Illustrator then import it in TBS to animate it.
A lot of it is just plain talent too 
Cheers,