I often mix my foundations, TM's and moisturisers to get my desired finish and colour but only do it when I'm desperate. I prefer to use one product that does exactly what I want without the fuss.
Yesterday I nearly puchased a new bottle of foundation, but battled with that urge. Instead, I mixed the Laura Mercier TM with Benefits 'You Rebel' TM, and the effect was great. Today I mixed Bourjois' 'Healthy Mix' foundation with 'You Rebel' and the finish was amazing. It seems like 'You Rebel' (something I nearly got rid of) is beautifying the finishes that I don't like.
The photo doesn't do the finish justice, my face is matte but it still has a glow to it. The shade is perfect too, but the flash loves to interfere!!!
Next time you "think" you need a foundation, why not mix what you already own to create your custom shade and texture.