You can create a beautiful dining room center piece simply by using three jars or vases that you already have around your home, and filling them with faux flowers. It is more attractive if the largest vase is in the middle and the two other vases are placed on either side.
To save money I wanted to reuse a lot of the same pieces that I’ve used in prior tabelscapes. The gray diamond patterned table runner I got about a year ago. I’ve used it a few times because the neutral color goes with so many looks. I would recommend buying a couple neutral colored table runners that you can use in multiple settings. I would suggest a white, a gray, and an ivory one. Those colors will pretty much work with any tablescape.
Another item I reuse a lot are my glass goblets. If you switch up the decor on the tablescape, but reuse the same glasses, the tablescape as a whole will still look like new.