Green, the color of nature is relaxing, fashionable and beautiful. It creates a calm and cozy décor. The colors green and white also have religious connotations. They signify the hope we have for eternal life offered by Jesus.
Noble Fir and Eucalyptus Wreath - "Create this glittering decoration by trimming a noble fir wreath with silvery ornaments and sprigs of seeded eucalyptus." from Martha Stewart, one of 33 wreath ideas when you click through the image