Magazine/Book transformation might be a neat one to try.
Digitization TF could be cool too.

oh? can you elaborate?

One where someone gets turned into part of a picture in a magazine/book, or perhaps even the entire thing, showcasing perhaps their life and or deepest memories up until that point!
Digitization is like becoming or getting trapped inside in a phone, game, or tv for example. Like a character popping out of the screen, grabbing someone, and pulling them both back in. There are other types, but that is just one example!

not stopping anytime soon: face removal

evil doppelgänger tf (for example .exe, or twisted)

I really like that hyper tongue pic of your axolotl and I would love for her tongue to grow even longer.

I’d want to see Eyu getting turned into an animate plush, only to accidentally fall in a box and get stored in some attic or closet, eventually becoming truly inanimate.

Or for something more simple, I still think novelty keychain tf would be fun.