Okay I can't really pick so I'll just list...
Dexter's Laboratory ...lol
Alvin and the Chipmunks
Rocko's Modern Life
The Ren & Stimpy Show
The Magic School Bus
Beetlejuice (Best Intro!)
Tom and Jerry
Teenage Mutant Ninja Turles! (Best Idea EVER)
Tiny Toon Adventures!
Thundercats (Just awesome...)
Cow and Chicken
The Powerpuff Girls (And once again the day is saved...thanks to, The Powerpuff Girls!!!lol)
2 Stupid Dogs
Ed, Edd, and Eddy
Scooby Doo, Where are you?
P, B & J Otter (umm..use ur noodle? LOLZ XD)
BANANAS IN PAJAMAS!!!!! (...Don't ask...)
Winnie the Pooh
The Super Friends
Captain Planet (most educational...about the environment...lol)
and last but not least...
PEE WEE'S PLAYHOUSE (Like the funnest show evur...I watched it on Adult Swim...)
Most of these I got to watch as a kid b/c my dad would like hunt them down on TV and we would watch it 2gether...lol
Fun times...Fuuun times...
And srry its SO LONG but I wuz kinda a cartoon junkie...lol