Don't really like that phrase but here's a few little things that I do that you may have not considered, especially when it comes to personalising things or making things last a bit longer.
So, a couple of things I do. I often mix a couple of different foundations together in a little travel size pot to create a perfect colour/ consistency and portable blend. ( as opposed to a heavy bottle you have to carry in your handbag)
Also, if your favourite lipstick is at the end of its life, I just dip a lipgloss wand into it and get much more use out of it rather than chucking it out!
There's lots more, like putting powder on under foundation (!) to make it longer lasting but it's late and I've had too much 
so anything you'd love to share I'd love to hear about...! 