Heee, this looks like so much fun!!! I am one of those people who would enjoy drawing the creepy, crawly, toothy, many-limbed grosslings, so thank you for that excellent list (with references too! wow!!). Perhaps I'll actually finish an Inktober (Yoinktober, 31 days of grosslings) this year
Also, I'm a bit late to the party, but I wanted to share my version of human!kitty!!!
I tried to make her hair match her cat face (M-pattern hairline, side-face fluff, and, uh,
conveniently placed bows for cat ears. I also tried to make her eyes and nose kitty-y, and I just realized i forgot eyebrows, oopsies), and I really liked Mirasol's idea of a fuzzy cloak so i gave her one (also my way of sneaking a tail in there
)). Oh, and one can't forget her nice grade-B cat collar