What are the go-to websites these days for finding custom texture packs (.pk3) for QL maps? I remember seeing a couple of movies where for example dm20 was re-textured.

Specifically I'm looking for texture packs for QL TDM maps like Purgatory, Limbus, Dreadful Place, etc...

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Otherwise, is there any tutorial for doing this myself? Or is it fairly straightforward? I've done it with weapon and player models before but something tells me re-texturing a map is a little more complex since it's not just one texture anymore, and these maps get their textures from different base pk3 files.