I used to mix Illamasqua's rich liquid foundation in white with MAC's mineralize skin finish foundation in NC15, however I think they started to react strangely to each other, as just recently the consistency changed completely and went really...bitty...? As if bits of the foundation clumped together and wouldn't blend out.
So I've abandoned that now, and I started using Bobbi Brown's Skin foundation in Alabaster. It's too dark for me however, so I really needed to extend it onto the neck and ears, which was a pain in the arse.
I went to the Bobbi Brown counter yesterday, and they have a new foundation, and the Alabaster in that one is much lighter than the Alabaster in the Skin foundation. So I bought it, and hopefully it will match my skin okay.