If these textures are legal, I demand my neon green paintballs back. Yes, taste differs from person to person, but from what I can tell, these new texture packs only serve one purpose: gaining visible advantage. It's not just this package, but seldas and spartax aswell and I really do think that there are more around, just unknown to the forum.
You either force everybody to use your offical hr4 pack, or allow everything (which is not necessarily a bad thing. quakelive even allows me to change the player's skin model and color. Since everybody can use that, it's not even unfair). Otherwise you cannot draw a clear line.