Make Stuff Yourself
One of the best ways to get a high-end custom look without spending your entire trust fund (side note: my trust fund consists of a stale box of Girl Scout cookies and a maxed-out Discover card) is to make things yourself. Including handmade objects in your home ensures that you have things that are unique and cannot be seen elsewhere. Which makes everyone think you are the fanciest rich person they've ever seen. Which makes them want to be your friend and/or date you and have your babies.