Comet Observatoryさんのイラストまとめ

Official Mario Strikers: Battle League artwork of Rosalina.

The boulder from Mario Kart 8's Choco Mountain and Bowser's Castle is an edited model of Rock Mario from Super Mario Galaxy 2.

Official Mario Kart Tour promotional image, featuring Rosalina.

Rosalina Sticker from Line's "Mario Kart Stickers".

@ajolot3 Magmaws are a smaller variant of Magmaarghs, which are closely related to Blarggs, an enemy first introduced in Super Mario World.

In Yoshi's Story, Blarggs were represented differently, becoming more similar to Magmaarghs.

- Mod Kiz3r

The planetoid that turns into Starship Mario in Super Mario Galaxy 2 is never able to be explored.

Despite this, it features full collision data alongside sound codes for soil, lawn, stone and wood.

Starbits and breakable rocks can also be found.

Rosalina and Luma stickers from Play Nintendo's Calendar Creator.

@LubbaSMG2 While none are in a 16:9 aspect ratio, each download contains three wallpapers with different resolutions:
800x600, 1024x768 and 1280x1024 respectively.

- Mod Kiz3r

Four Super Mario Galaxy 2 wallpapers were available for download in the game's now defunct website.

Rosalina Sticker from Line's "Talking Super Mario Animated Stickers".