I have a pale olive complexion (fair olive), and it's extremely hard to find a good foundation match. Everything is either too yellow or too pink. I have found one that I like in a powder formula (Alima Olive 0), but finding a liquid one has proved a lot harder. Even if I can find a close match, I don't always like the formula (too heavy, too drying, etc.). I also enjoy using makeup products that are more natural (e.g., Jane Iredale, RMS Beauty), which limits my options further.
I have seen it suggested that people with hard-to-match complexions add pigment to foundation to get the perfect match. If I understand right, I would either buy a neutral foundation and add a little green pigment, or I would buy a warm foundation and add a little blue (since yellow plus blue creates green). This would enable me to use whatever formula I like and not have to worry about a perfect match. Has anyone tried this? What were your results?