Back around 2003 or 2004 I remember UPN (back before it merged with WB) had a CG cartoon called "Game Over" that was all about video game characters lives when a game isn't being played. Yeah it was basically sort of like Wreck-It-Ralph almost a decade before it was made, though this show was more of a somewhat typical Simpson's esque sitcom. The show bombed pretty hard as I recall only like two or three episodes airing on TV before it got taken off the air (I recall the six episodes that were finished later got a budget DVD release but I don't recall ever seeing it). Given I was a teenager going through puberty at the time I admit one of the few things about the show I remember was they surprisingly did a Dead or Alive Extreme Beach Volleyball parody in one episode, complete with jiggle physics and a joke where a dumb blonde character had the ball spiked between her tits and she somehow didn't notice (I did say it was closer to a Simpson's like sitcom after all). Looks like some episodes are on YouTube at least.
Another obscure TV CG thing I remember is a scrapped pilot airing once or twice on Cartoon Network around 1999 or 2000 called "Groovinia." It had a theme song by The B-52s, and voice talent consisting of some pretty well known names like Paul Reubens (Pee-Wee), RuPaul, and Dennis Hopper. However the animation and story feels more like the result of a 1960s drug trip, though I wonder if that was intentional. Probably the best thing to come out of it aside from the B-52s theme song is this classic YTPMV from Captpan: