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Aviation gasoline is colored for identification and to aid in verification of contamination. The most common fuel available now is blue color for 100 octane low lead. This fuel basically obsoleted the old 100/130 octane which was colored green. The 115/145 octane stuff was colored purple but all these fuel mixes are hard to get unless a person ordered a very large quantity and that would only be from a batch plant that is capable of supplying all the ingredients. Tetra Ethyl Lead is very closely monitored due to the regulation from the EPA. It's kind of like dynamite or gelignite being closely monitored by the ATF. Log records have to be kept on the use and sales of dangerous materials.
I've seen auto gas in all sorts of colors but green sounds like a mix of several types that just happened to look green after the mix. Cross contamination is also possible. Something blue mixed with something yellow would look green.