Have been struggling to find some nice Rust wallpapers, so I decided to make one for myself.
On the left is Ferris on a canvas. On the right is Corro the unsafe Rusturchin. (The contrast between safe (art-like) and unsafe Rust is supposed to be the joke here.)
Edit: The original image is 1080p. I got the drawings of Ferris and Corro from rustacean.net
I suppose there should be something like Crang (“friend” of Shredder) without exoskeleton and covered with spikes, like your Corro.