If doing fruit, a nice idea to go with slices since the layering would fill an entire small square vase. Small, square, glass vases stuffed with sliced limes and purple hydrangeas to sit at the center of the tables.
Mason Jar Centerpieces Tied Together; gold and teal ribbon with white flowers - inspiration! My vintage blue jars tied together with the dark blue lavender in them for my centerpiece on the dining table!
Smaller vase inside larger to decorate vase. Floating candle in the middle. Could do it with lots of other things besides lemon slices such as beads, pearls, flower petals, fabric, ribbon. Possibilities are endless!