Mario's oversized, gore-covered wrench, and Princess Peach's blood-stained pipe are just a few of the things that make these images hilarious and creepy. Judging from Saari's flickr page, he's photographed many a zombie walk, and has a penchant for horror-themed imagery. Since we like that sort of thing around here, I encourage you to visit his website, where you'll find pretty girls chained to radiators and other macabre scenes. His flickr page also has a series of "witch" images, which remind me of old Hammer film babes.
Go forth and explore, and then follow Saari on Twitter for updates.