If there was one thing from CN's past I do wish would return it'd have to be the whole CN City theme that they had from like 2004-2008 (mid-2008 saw the start of the "Nood" theme for about two years, and once shows like Adventure Time and Regular Show came along and got the channel back on track after the live action failures we have the theme we have now, which I'm not sure what to classify as, it's like a modern version of CN's "checkerboard" theme that they had during the first few years they were on the air).

Just the whole concept of the CN City was really cool, it's like a modern take on Toon Town from Roger Rabbit. Seeing these various characters walking around interacting with one another, along with including recognizable landmarks from individual shows. Like the City of Townsville is just across the river, Titans Tower was on a small island like how it is in the show, the suburban cul-de-sac from Ed, Edd, n Eddy, Pop's Diner from Johnny Bravo was in various bumpers, and I think Fosters Home for Imaginary Friends was a location in the city as well.