There are several groups of colors with trans-national meanings. Green, yellow, and red, sometimes also with black, are Pan-African colors; for examples, see the flags of Benin, Congo (Brazzaville), Guinea, Mali, Senegal, and (with black as well) Ghana and Guinea-Bissau.
Red, white, and black, usually also with green, are Pan-Arab colors; see Egypt and Yemen, and (with green as well), Jordan, Kuwait, Iraq, or Syria.
Green by itself is a symbol of Islam, as on the flag of Saudi Arabia. Red, as already mentioned, is symbolic of revolution in general, and Communism in particular.
The red, white, and blue combination is (in addition to its meanings to Americans or Frenchmen) the color combination of Pan-Slavism: Croatia, the Czech Republic, Russia (actually, I believe the white, blue, and red combination orginated with the Russians, with various explanations of what the colors stand for, and was then adopted elsewhere as a symbol of Pan-Slavism because those were the colors of Mother Russia, the leading Slavic state), Slovakia, Slovenia, and Yugoslavia, with Bulgaria using a variant which substitutes green for the usual blue.
I wonder if the ambassadors from some of these African, Arab, or Slavic nations ever get confused? Especially at the U.N., or at meetings of the OAU or the Arab League.