DECORATE!

There are lots of ready made Christmas decorations available for download online or from most productivity software.

Microsoft's Office Online has a number of Christmas themed banners you can customize and print using several pieces of paper.
 
You can also learn how to make your own DIY decorations from everyday material from popular sites such as AllFreeCrafts.Com
 
http://www.allfreecrafts.com/christmas/index.shtml