I always liked The Flintstones.
Why, you ask? Because... "They're a modern stone age family."
Actually, I grew up watching them nearly every day after school. There was always some channel playing them during the afternoon.
I know that after a while the episodes can seem to be a bit repetitive, but for me it's like coming home to see old friends. I just never tire of watching Fred get dumped out of the window by their sabre-toothed tiger/house cat.

Now, to turn on the tv and see (nearly any time of the day) The Flintstones playing somewhere, on some channel always leaves me feeling a bit nostalgic.
With that said, and even though I like The Fnintstones, my favorite toon of all time would probably have to be...