I made a mollusk! Sorta, kinda. If you consider Cthulhu a molluskoid, certainly the Ood has to be one too. After all, that Dr. Who wiki page refers to the Ood’s coleoid tentacles, and that seems official enough for me!
I’m not actually a particular Dr. Who fan, but my friend is, so I made her this, for some fancy wall art:
You might kinda have to squint your eyes to see the character, but here it is in screencap form.
Tentacular! It didn’t occur to me until I was finished making this beast that it had anything to do with mollusks, because of course it’s only fictionally molluscan. But fictional mollusks need love too!
Here’s a clip of it in action:
The Shell and Mantle 
Now that’s thinking outside the box! I’m both a mollusc fan and a Dr Who fan, but it didn’t occur to me that, of course, the Odd are molluscs. Thanks for the ‘a ha!’ moment!