Cardcaptors, Pokemon, Code Lyoko, Butt-Ugly Martians, Rocko's Modern Life, Cat-Dog, Powerpuff Girls ( shut up ;~; ) Jimmy Neutron, Courage The Cowardly Dog, Ed, Edd, N Eddy, Teen Titans, and Rocket Power all come to mind.
And yes there was a show called Butt-Ugly Martians. The theme song is STILL stuck in my head, as well as the awkward 3D animation that was considered groundbreaking at the time.