Stack and glue candle holders! Such a good idea. You can get the height seen in this topiary by stacking a few dollar store candle holders together. Glue them with a glass-appropriate glue (like spray paint black, and then place a flower ball on top.
Cylinder vases are so versatile.floating candles/submerged flowers, flowers arranged on top, or turn them over and use them as pillar candle holders with flowers underneath, use them for stands for other arrangements or platters of food.