Considering the backpal is not an alphablended layer, the NPC would need to use the same pallette as pics1.png and just take all backpal changes on itself...
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"Whatever," said Bean, "I was just glad to get out of the toilet."
"Power does not corrupt. Fear corrupts, perhaps the fear of a loss of power."- John Steinbeck
"I'm only acting retarded, what's your excuse?" queried the Gord. - My pet, the Levelup Gnome
Well, I have noticed that if you take a part of pics1.png in a NPC (For example, setimgpart pics1.png,32,0,32,32; would end up with an NPC looking like a bush which changes if the backpal changes)