Re: tarte or nars colors[ Edited ]
If your undertones are neutral, many of these shades would flatter your skin -- I don't even know where to start! Do you prefer a matte finish, or one with a bit of shimmer?
Without more information, I can tell you that my favorites are NARS Deep Throat (similar to Orgasm / shimmer), Gaiety (bright pink / matte, but applies much more sheerly than Desire or Mata Hari) and Gina (matte peach).
Among the Tarte Amazonian Clay blushes, my favorite is Natural Beauty (a strawberry red, but it looks so pretty and natural when applied with a light hand) -- but I also like Tipsy (coral), Exposed (a nude color with rosy undertones) and Dollface (light pink).
For better suggestions, please feel free to update your post!