Hey, if anybody wants to know how to use a Palette to Recolor something, there's a GIMP filter! Post
Here! Also, there's Palettes you can find
here! You need to convert and export the palettes to be GIMP-ready however. You can use
Paletton for that, or use GIMP's
Image Convert to Indexed. I also feel like it should be worth noting that more about palettes can be found
here, and also that GIMP can be downloaded for free
here!