To give a cream, gel or stain blush a natural glowing-from-within look, pat it on over foundation and then dust some powder, mineral or powder foundation over. This is also great for ensuring your blush isn't overdone.
Love vitamin E in your creams and serums? Rather than buy a large jar with a short expiry date or lower levels of vit E, try pricking a vit E oral capsule and using the contents like a serum. Always fresh and more concentrated than anything in a cream.
Do you find your gel or cream liners melting down your face? Try setting it with matching eyeshadow or a translucent powder - like silica. It works for me. :)
To get more uses out of your false eyelashes take time to clean, shape and store your lashes. Also, rather than just yank them off your eyelids, hold a cotton pad soaked in eye makeup remover and wiggle side to side. You should be able to remove the lashes easily.
Speaking of removing eye makeup - this may be rather 'duh' of me, but a side-to-side wiping motion works better than a top down approach. It removes more, faster.
Find your facial wipes drying out too fast? Try storing then with the sticky flap down. It keeps the flap closed and ensures your top wipe is always moist. I've always done this but xsparkage reminded me that not evryone knows this trick.