Here's a list of some cartoons I've seen before, some vary in style so you'll eventually find something from here that you like and you can go from there to find things similar.
Spongebob Squarepants, Aaahh!!! Real Monsters, Angry Beavers, Chalkzone, The Mighty B!, Invader Zim, Catscratch, Rocko's Modern Life, Regular Show, OK K.O, We Bare Bears, Clarence, Chowder, The Grim Adventures of Billy and Mandy, Class of 3000, Clone High, The Oblongs, Disney's Teacher's Pet, Mission Hill, Freakazoid!, Dr. Katz, Professional Therapist, 12 oz. Mouse, Duckman, Pepper Ann,
Sabrina The Animated Series, Space Ghost Coast To Coast, The Brak Show, The Critic, Futurama, early Simpsons
