The FAQ states that Your submissions and series may only contain materials or images that were created entirely through your own effort. However, it also adds that Failure to obtain proper permission for the use of materials protected under copyright leaves your NeonMob submissions and cards/artwork/series vulnerable to removal., which indicates that it is possible to use other materials as long as proper permission is granted.
Would it be alright, then, to use a texture provided by another creator within the creative commons zero license?
Just wanted to be sure. Thank you for the response.