Religious guidelines website. 

Decorations should be limited to non-religious items, and please refrain from decorating with live plants in case patrons or staff members have allergies. 

"Other non-religious, seasonal items that may be used to decorate workspaces during the winter months include snowflakes, wreaths, garlands, and lights. Please use good judgment in the use of such decorations so as not to disrupt the work of the unit." -- From guidelines website.