These are the custom rosaries that I've made over the years.
The materials I use for any particular rosary just depend on the situation.
If it's for a specific person for a special occasion, I'll often use a birthstone with a centerpiece to match the occasion (i.e. dove for Confirmation, chalice for First Communion).
Sometimes I'll just see a picture or get an idea for a cool color scheme and then run with it.
I'll occasionally accept requests to make a rosary for someone else; in which case I'll work with them to choose the parts that are right for the occasion.
No matter who picked the parts, there are no other rosaries like these in the world.