Accent plant? Pffff. That would be the accent to the accent plant.
Perhaps a blade of grass? Or a covering of moss. Good luck keeping that watered in summer
Rory I style Bonsai naturally, just as they would appear in the wild.
Central Coast, NSW
Bonsai: Casuarina Leptospermum Banksia Phebalium Baeckea Melalueca Ficus