For face powder, add pigment until you get the desired color. It might literally only take 1 teaspoon of powder to get the right shade, so constantly mix and test to get it right:
Pigments you can try:
green clay
red clay
organic cocoa powder
mica
For PLAIN powder just for oil-control, just use cornstarch.
To OFFSET redness, use 1/2 cup cornstarch with 1 tablespoon green clay.
BLUSH:
Blush starts with cornstarch, and then you add pigment, a little bit at a time, until you get the right shade for you.
Pigments to try:
tomato powder
beet root powder
mica
EYESHADOW:
I generally take a bit of my face powder and then add more pigment to it to make it darker. However, you can also do just cornstarch with mica. Appropriate pigments for eyeshadow are generally mica, clay, or cocoa powder.