Siberian carpet cypress
Russian arbor-vitae
microbiota decussata latin

Or you could choose an evergreen that does change color, the far less common Siberian cypress, Microbiota decussata.

The entrance facade is covered by an extensive green roof, which is planted with Microbiota decussata and Juniperus squamata.

Although generally accepted as the only member of its genus, it has been suggested that the closely related species Microbiota decussata could be included in Platycladus, but this is not widely followed.

The Cary Award's five winners include Microbiota decussata, also known as Siberian carpet cypress, an extremely hardy (to zone 3), prostrate, wide-spreading shrub with a graceful, layered effect.