Detroit is in the US, so we’ll use use the American spelling of colo(u)r today. The Detroit flag represents a kind of renewal. We all know that Brock invaded and burnt it down, and jobs were lost when the automotive industry moved abroad, but no matter how many times the city gets knocked down, it builds itself back up.
The cats are from Affinity designer, to remind you which program the palette is for, using the swatches in the palette.
Please link to and credit Udigrudi.com if you use this palette elsewhere.