I'm not sure if this is really strange or not. If some of my nail polishes are getting old or gunky, I'll put them under some warm water to loosen up the polish and then re-shake them. Usually helps to make them runnier again and mix back together again.
But I'm not always a huge polish person, so I'll end up finding a polish I haven't used in years and has separated and won't mix back together with regular shaking. warming it up tends to help mix them back together again.
My aunt used to use lipstick as a blush, although I don't like the feeling of thick creams on my face (don't like the feeling of liquid foundations either). I've used blush as an eye shadow though.
OH another one -- Glad Press and Seal Wrap. For any of you girls who use powder/mineral foundations and have to travel...Wipe off the top of your sifter (needs to be clean and powder free for it to stick well) and then use this to "close" your sifter when you travel! A short trip always gets all my powder sitting on top of my sifter whenever I travel, but if I use this method to close the sifter, all the powder stays in the bottom compartment, and it's sticky enough to remain closed through a jostling trip in a makeup bag, but not sticky enough to leave like a sticker type of residue on the sifter lid.
I usually bring an extra piece of wrap with a small pair of scissors to have a fresh seal for the trip back, too.