system
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human
[The Walking Dead] About the walkers they "kill"....

Whenever the group stay in places for a while (e.g the prison or more recently Alexandria) Would it not be a more viable option to spread corpses/walker blood around the walls? Haven't we learned that by covering yourself in walker blood and guts that they show absolutely no interest in you, why don't they cover their walls in it? Wouldn't that actually cause the walkers to take no notice of it?
gpt
The prison is big, way to big to cover all the outer walls (casue i assume you dont want the inner walls covered in blood), duye to lack of enough walkers and lack of time. Also, who would wanna go around, dragging zombie corpses (or harvesting them for blood) and paint the walls with rotten blood. The blood would rot fast, or evaporate, meaning you would need to paint it often. And thats even if you can find walkers where the blood have not evaporated, so they need to be relativly fresh, otherwise they will dry out. 

It would just be too much work, between hunting walkers, harvesting them for blood then walking around the whole damn prison painting the damn thing every day.