As a general head's up, without pointing fingers at anyone: While it is perfectly fine to adapt stuff from outside sources to work for MH, it is up to the user(s) to make sure that all copyrights and licenses are followed. That includes following the chain back to its origin.
For example, if someone at site B has ripped assets from commercial copyrighted 64-page EULA game A, and user C then adapts the assets from site B and post them here, then it doesn't matter if B and C says "sure, do whatever you want with these", because the assets are still bound by the license from source A.
My approach is to not censor these forums, nor moderate any assets. If I get a takedown request for something, I'll simply compy with that, no much harm done. In my view it is up to the individual authors to make sure they don't violate any licenses. But it should be noted that this also means that I in no way guarrantee that everything you find here is unproblematic to use in all contexts.