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.
DIY tall centerpiece inspiration: Use glue to stack short dollar store glass candleholders onto each other to create a tall centerpiece stand. Glue to square mirrors for a stable base. Add flowers and hanging crystals strands for the finishing touch!