1. Perhaps the easiest thing to do with a foundation that does not match is to mix it with another one. I mix a good majority of my foundations throughout the year. My Bare Escentuals foundation is way too golden for me, so I brush it over a lot of my warmer foundations.
2. If your foundation is too dark, you can use it as a bronzer instead. I currently use Bobbi Brown’s foundation stick as a bronzer and am absolutely in love with it. Because it is a foundation (or perhaps because it is Bobbi Brown), it applies very smoothly and gives my skin a natural contour.
3. Consider using your foundation as a concealer. My Clinique foundation is too light and pink for my skin, so I use it to conceal spots. Luckily it contains salicylic acid, so it not only conceals my blemishes, but cures them too.
4. Use your foundation as an eyeshadow base. This will not work with all foundations, but my Bobbi Brown stick foundation seems to be holding out pretty well as a base.
Of course when you realize that none of these things will work for you and there is absolutely nothing you can do with your foundation, donate it to a friend, a charity – or simply sell it. There is no use letting perfectly good foundation go to waste.