@skicoak knows what's up with Batman the Animated Series. That's a biggie for me.
Also really any of the original Looney Tunes, particularly Bob Clampett, Friz Freleng and Chuck Jones at the directors helm. Though I'd hardly consider them to be kid's cartoons by any stretch of the imagination.
Also any of Genndy Tartakovsky's early stuff like Dexter's Laboratory and Samurai Jack. I really dig stylized art like that.
More recently I really like Gravity Falls, and The Amazing World of Gumball. And...even Teen Titans GO! (That's a super unpopular opinion I know, but it makes me laugh and I like the art style ಠ_ಠ)