Another crossover idea that I've had, this is Nicktoons vs Cartoon Network. This version features many characters from both networks battling it out. There'd also be an expanded version where all characters would be re-designed in anime form, similar to CN's FusionFall. This expansion is called Nicktoons vs Cartoon Network: Universal Destruction.
The cover was based from the design of the cover to Cartoon Network Punch Time Explosion.
NvCN's Wiki page: [link]