Cartoon Network (partially lost "CN City" bumpers from TV channel; 2004–2007)
From The Lost Media Wiki
In June 2004, Cartoon Network debuted an updated version of its original logo (with the checkerboard motif retained and the "C" and "N" being the centerpiece) and a new slogan, "This is Cartoon Network!" The bumpers introduced as part of the rebrand featured 2D cartoon characters from its shows interacting in a CGI city composed of sets from said shows.
During April 2006, there was a revamp of the CN City look using flat, dark, psychedelic colors, and a male announcer replacing the previous one (Nikki). These bumpers continued until June 2007.
While many of these bumpers are available on the Internet, several of them have yet to be found, particularly the 2006-07 ones.