From the “Small Findings” sub-blog of Mario obscurities site Supper Mario Broth comes this collection of concept art for Luigi, from last year’s Super Mario Bros. Movie. Here is the original post.
Here’s another image, from the main Supper Mario Broth site. Several spinoff Mario titles have promotional images for fake Mario universe companies used as background art elements. Most of the time these are used in the Mario Kart games. There were a few made for the original Mario Strikers, that went unused in the final game. This one appears to be for some kind of Bowser Support Hotline. Original post.
The image of Mario and Luigi eating together is included in the Super Mario Game + Watch from a few years ago. Nice to see where that came from!