It boggles my mind that there hasn't been a TF2 warpaint or CS:GO skin reminiscent of the missing texture yet. That seems like an absolute no-brainer. Of course obviously cleaned up to look more professional. Not looking so low-res or having the material glow. Also to not confuse it with actual potential missing textures a player might have. (or rather don't have)
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The closest we've gotten was that one tf2 warpaint that was bugged on the holy mackerel last Halloween, they fixed that in like a week though.