I was wondering if you have any plans to create a new version of PoP that allows the user to import color palettes from vintage gaming systems (NES, Genesis, Commodore 64, et. al.) in order to achieve a more authentic design.
Recently, I found a message board which had a link to download Adobe Color (.aco) files of old school color palettes including ones for the NES/Famicom, Sega Master System, the Sega Genesis and others. I don't really know if your freeware would be able to accept anything from Adobe, but it's worth a shot.
Here's the message board (the link is on the first post and it's still active):