I am having the hardest time deciding what to do for our centerpieces. We rented these tables:

And our theme is rustic/vintage. I can use a table runner just like those or burlap ones. I also have crocheted lace doilies (pictured below), mason jars, galvanized buckets, and white starfish like in the picture.

The reason I am having so much trouble is I do not want to use fresh/fake flowers! I am open to dried flowers or things like that, but I'd prefer no flowers at all.
I am also open to purchasing more supplies like candles or vases. I only have 5 of these tables to it doesn't have to be SUPER cheap.