Saw bits of the feed via internet uploads. Not my cup of tea games, but Splatoon is definitely the freshest FPS out there. There might actually be more innovative shooters among the endless XBLA/PSN/Indie pile of games, but let's face it, most of those are low budget. Splatoon has some god production values.
Mario Maker is the best IMO. More games should come out with this. Granted, Mario is a 2D game with predictable making it easy, but software like Kodu, Project Spark and LBP are probably overwhelming for most but the most dedicated fans. Hilarious to see the end where the guy trolls with the brick wall.
Games that have customizable survival/horde modes partly give the feel of creativity, but not like this.