Sure you can make your own lift.
Heck, you can make your own entire suspension system if you're creative enough.
Lots of people on here have posted lots of great ideas of all sorts to take a stock vehicle higher in the air, usually to fit larger tires or to get more ground clearance.
What kind of vehicle do you have? Is it front wheel drive or rear wheel drive? Is it 2wd or 4wd? Do you drive an Arieo, Forenza, or a Sammy, for example?
There are lots of things you can do to lift something.
Give us some more info and we'd love to help you out.
~Nate