I’ve been a fan of Max Winston ever since I got a glimpse of his visually explosive/über-violent short I Live in the Woods! (Fair Warning: It is über-violent. Like, mega über). He also does a lot of work at Screen Novelties, where he developed and did this animation test for a television show that Nickelodeon has, sadly, elected not to make.
I would also recommend checking out this blog post, showcasing oodles of character designs and preliminary artwork for the show which Nickelodeon has, sadly, elected not to make.