I have a suggestion! Maybe, if you're into this sort of thing, you could do a Mary Poppins series of Outfit/Hair Bases? I searched up Mary Poppins in the search bar and the results were not plentiful :(
Just a suggestion though :)

I've justgot a ton fsuggestions (sorry I'm lagging really, really mbasd)
movies: harryr potter
books: the night gardener by jonathen auxier,
shows: hilda on netflix,
video games: w zelda, mario, splatoon, that smash ultimate thing
and random other things: tea leaves, oreos, ukeleleles, pink, yellow, white,etc.

Maybe combine two animals into an ob or hb?
Anime: Konohana Kitan, Slow Start, Aikatsu Friends
Books: Secrets Of My Hollywood Life
TV/Netflix/Movies: Disney, Carmen Sandiego, Chilling Adventures, Kaijudo, Bolt
Video Games: Sims

Hello! I suggest you do a series on instruments! (piano, clarinet, trumpet, etc) I really like your skins!

Have you created skins for the newest Doctor Who season? Those would be really cool.

Definitely Love Anime Bases...Do Some Of Those! Like I Saw In Another Comment Maybe Fairy Tail But Also Maybe Naruto Bases Too! Or Maybe Outfit Bases For Human FNAF Characters? Im Just Saying Random Stuff From My Mind!

Maybe something like (maybe u did this before) you do like an ob and then u do a hb but they like are meant to go together?

I think pride ouf**** and bases could be neat, but maybe simply as inspiration.

Anime outfit ideas: Fairy Tail, SAO, Karneval (no pun there - it's an actual anime)

Book ideas: Anything Riordanverse (PJO, HoO, Magnus Chase), Harry Potter, Hunger Games

TV/Netflix or Movie ideas: Disney-themed, Voltron, She-Ra

Also, for fun sometimes I go on https://coolors.co/ - and try to make a skin based off a randomly generated palette. :) Hope this helps even if just a little!

Make a series of royal bases :D