Picea Glauca "Conica"
 
The Dwarf Alberta Spruce is a slow growing conifer. They are often pruned and used as a sort of topiary. Greenscape Services also has some that are already pruned and shaped into a topiary and spiral shape. This tree stays fairly small, growing to be only about 8' tall and 4' wide. While it would look great in any size landscape, it makes a beautiful addition to any small space.