Modified NERF gun:

I have really been into making custom Nerf guns lately, so I decided to try to make one for good ol’ Mario. Here is what I imagine it would look like. The ammo of choice is a Bullet Bill, and of course there is a working flashlight for all those dark pipes he has to explore. I wanted to incorporate as much of the Mushroom Kingdom as I could with this gun, so I also added Piranha plants on the sides and a super star on the back. I had to take out the functionality of shooting darts, so I added a sound every time you pull the trigger. It is the sound of Mario getting bigger. (Source)

Really neat.  You gotta love the attention to detail.

More pictures over on the flickr page.

Hat tip: Chris, Mark