I'm a veteran NSMBW modder, but i also make texture hacks from time to time.
In August 2017, before the drama happened and files were taken down, i had collected all the Texture Hacks that i could find on the Internet, to make an own pack. While the pack might be never finished, the files have been preserved and sorted, and they are all available here.
NOTE: Most of these files are untested to this day, so they might crash the game and/or be worth a ban on Wiimm-fi. Please test them before using them for online play/texture packs.