Almost three years ago, I bought Bare Minerals make up for my wedding. It lasted for quite a while, however, once it was gone, I couldn't justify spending THAT much money on make up.
As I was cleaning out my make up bag, I discovered the last little bit of mineral veil powder left in its jar. In my pregnant brain, the thought occurred to me: "That looks just like baby powder." I currently have 75 lbs of baby powder at my house. (Well, maybe not that much, but it seems like it. We got several containers at baby showers.) I put on my make up and tried out the baby powder on top. It worked pretty well, but made me look washed out (duh, it's white powder). To tint it, I added a little bit of cocoa powder. That solved that problem (and made me hungry for brownies).
One last issue with it: it didn't really stay on for too long. My skin would start to get oily and the powder didn't do too much to stop it. Solution: corn starch. Voila! I had done it. Cheap "mineral veil" that works basically the same for a fraction of the cost. So here's the breakdown:
1 tbs cornstarch
1/2 tbs baby powder*
sprinkling of cocoa powder (add a little, stir a little, until you reach your desired shade)
Apply with a big puffy brush on top of your make up.
*Recently I've had a lot of emails and comments talking about the baby powder component of this. I wasn't aware that there were different kinds of baby powder (first-time mom!), but the kind I used is pure cornstarch infused with aloe and vitamin E.