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Early concept art for the Luncheon Kingdom from Super Mario Odyssey, seen in the Art of Super Mario Odyssey book. Note the design of the buildings to resemble cabinets and other furniture that would be seen in a kitchen; this concept was not used in the finished game where the architecture of the kingdom is simply in a Roman temple style instead.

Rare artwork of Mario hitting his head on a pipe in World 4-Fortress 2 of Super Mario Bros. 3, used only once at a small print size in the official 1988 Nintendo Power guide for the game and nowhere else.

The only place official artwork of a Block Boo in Yoshi's Story appears is in the 1998 German official guide for the game, being absent from all other guides. The artwork is notable for seemingly depicting the Block Boo mid-transformation, being neither fully round nor an actual block at that point.

Source: SCANdalDE

Top: the Aviator outfit as seen in Super Mario Odyssey, from the back.

Bottom left: Mario's Aviator outfit in Mario Kart World is nearly identical to the Super Mario Odyssey version except for the addition of a white scarf.

Bottom right: this scarf has actually been added there to create a matching couple with Peach's Aviator oufit, which has the same scarf.

Set of officially licensed 2010 Super Mario Galaxy 2 keychains from Japan.