I guess CC0, just use anything you want (as long as you don't just redistribute the textures themselves) conpletely free, just make sure to put my name or itch.io page somewhere in the credits!
CC0 is a completely different license than the one you are describing, you are describing a CC BY 4.0.
https://creativecommons.org/licenses/by/4.0/deed.en
https://creativecommons.org/publicdomain/zero/1.0/deed.en
I linked them so you can take a look.
Let me know which one you decide! I'd love to use this if it IS CC0.