I don't know if these were flash animations, but I think they were possibly Shockwave instead. I'm also not 100% sure if the first one is CN but I feel really strongly that I saw it on there or something adjacent to it. I was really young when I saw this so the memory's super foggy.
This was in the early 00s, could be around 2001-2002 but that's a guess.
On Cartoon Network's site there were some cartoons that made with flash that I don't think they showed on TV (I found out about a show called Wendell and Wuggums that was one of them) and I'm trying to remember one I saw that was something like this:
An anthropomorphic bird meets some disgruntled mother pushing around her crying baby in a stroller, and she's super pissed off and annoyed at the baby. The bird does something to get rid of the child and the mother's all relieved and grateful to him, or something like that. That's really all I have. I keep imagining the Fruit Loops toucan when I try to remember what the bird looked like so I don't think my memory of the visuals are really reliable or anything like that.
The nick.com thing was most likely shockwave like those Clickamajig things they used to have. It was in 3d and had something to do with a boy in space, possibly talking to/fighting animals like a tiger or something like that. There might've been some kung-fu thing going on but it's really hazy as to what was actually happening. I mostly just remember it being a shockwave animation in 3d. I tried to check the Wayback Machine on nick.com but couldn't find this thing.
I'm hoping somebody also saw this stuff or has vague memories of it or knows what the hell I saw, but its really vague so I kinda doubt it.
I found the Cartoon Network animation completely by random today, recommended to me on YouTube. This is insane, I never thought I'd see this again! Now it's just the Nickelodeon animation I need to find.