Honestly, I’ve had the light green after taking a vitamin supplement that I did not need. You can get red by drinking a lot of beet juice (the juice in the jar of sliced beets), but if you haven’t done that red is very bad.
This handy chart is from the Aussie government. Other colours are possible, but have specific causes that most likely require medical attention. There are other things that were already mentioned in other comments that could cause weird colours.
Like not dealing with entitled adults? Be empathetic as much as you want, but sometimes you gotta realise some people don’t learn unless they come up against it. And those people usually think they can push kids.