Alas, mnemonics always seemed no-go to me, at least in the usually-advocated ‘use them everywhere’ approach—because I never had any memorable ones pop up in my mind. And if I made up some random ones, I would likely just forget their associations also. IMO Anki is a very different method altogether: it just keeps the info warm in the brain until it's burned into the memory—which is supposedly approximately one the ways memory actually works.

OTOH I just learned that green and orange in the Irish flag stand for Catholics and Protestants respectively, while in the Ivory Coast flag, they symbolize some run-of-the-mill cliches. So now I'll know that when I see Catholics first, it's Ireland, and when I see “color of rich and generous earth”, that's Ivory Coast.