When you need two colours in one place, where do you look? Right here, and get a face full of red, then a yellow-green in a standard 5mm LED package.
It's a milky-white T1-3/4 LED, with 3 legs. Power one side up, and it's red. Power it the other way, and it turns a yellow-green. Why you need to show off a yellow-green, that's your decision, but it's a great price.