

Top row, L-R: Heavenly Rice Powder in Medium/Dark, Heavenly Rice Powder in Light/Medium, Divine Oil-Control Primer, Celestial Silkening Powder
Middle row, L-R: Hope 3.5, Hope 3.8, Hope 4.2, Hope 4.5
Bottom row, L-R: Faith 4.0, Faith 4.2
Eyeballing the samples, I think my best match would be Butter Pecan.
EDIT: Yup, Butter Pecan!
When I tried Cornsilk, it was a perfect match! I wore it the rest of the day. I love the powder - it has light to medium buildable coverage, great slip, and a velvety matte finish. The pores on my nose appeared smaller, and it evened out the surface of the skin, making my cheeks look really smooth. I have to get a full size of this!
Another thing is that they run a bit light. The only ones I'll be testing are Amenti, Ashnan, Themis, and Hebe, which appear to be the closest to medium.
EDIT: I got the Sands formulation for everything, and the coverage is fantastic! Enough to cover imperfections, but not cakey. The finish is matte, but not dry-looking. Definitely fullsize-worthy. My best match seems to be Amenti, which belongs to the yellow-olive family, but I've only tested it under one kind of lighting so I can't say for sure yet whether Amenti is truly my shade. More testing is in order.
The spots virtually disappeared. As for the undereye circles, at first I was concerned that it was too light, making me look like a reverse raccoon, but in a while it settled wonderfully and blended into my natural color. And the staying power is remarkable. I applied it in the morning, and when I came home at around 8:30pm, it was still in place. It didn't crease, cake, or melt. But because of that staying power, I had to remove it with an eye makeup remover instead of just simply washing it off.
I would recommend this for times when you'll be out the whole day and won't be back 'til late, because it doesn't budge and lasts so long.
But I tested it today, using a light layer of application, and I was pleasantly surprised to see that I didn't look sick or ghostly. And I love the formulation of the powder! It felt feather-light, it spread easily and didn't clump, and it did a great job with my pores. It wasn't a waste of money after all.
However, I have yet to try it with a heavy-handed application or additional layers. But as it is, as long as I keep the application light and thin, I can definitely wear this shade.
I might have to buy Sunstone, though. It's the next darker shade. Just for peace of mind. ;)