People enjoy plants growing in the shape of their initials or customized name in tiny plants. This is not a dead-end business. You're commissioned to shape plants. Add to that the cost of the templates and any chicken wire frames you order built for the occasion. Some people order their hedges cut into topiaries for special events such as weddings, anniversaries and parties.
Mazes are popular.
So are trees grown together to form canopies. Create a bower or garden room with arches and tunnels of hedges made by braiding trees together. Create miniatures of animals from templates and cover them with moss, ivy, or other plants. They are popular as gifts. Enclose a package of seeds, and sell topiaries by mail with growing instructions to buyers around the world.