I'm in the process of cataloguing and collecting as many of the 2012 Cartoon Planet bumpers that I can find through private/dead YouTube URLs. So far, I've found nine videos. You can see my current process here: archive.org/details/cartoon-planet-2012-bumpers
If anyone remembers a certain bumper/segment that isn't listed on this page, please let me know and I'll do my best to find it. I've only run into one video that hasn't been archived so far.