Wool Felt Balls

I ordered these little beauties from Etsy last week and they came in the mail today.  I couldn't wait to touch them and see the vibrant colors up close and in person.  They sure are pretty.  This weekend the red, green and white ones will become a garland on the fireplace mantel.  All I have to do is decide what to use to string them with.  Should it be twine or embroidery floss or maybe some perl cotton?  Not sure yet but it will be fun to figure it out.