Oh, sure, you can string them and put them on the tree as garland, but there's so many more ways to use cranberries to decorate for the holidays. Here's just a few ideas from BGH:
Add them to glass cylinders for a festive nest for candles. (I particularly like how you can get varying heights using the same candles.)
Use a fluted cake pan or gelatin mold to make a frozen cranberry wreath. Of course, the climate in which you live would come into play here or you'd have a red puddle at your front door.
These luminaries are glass vases filled with SnoWonder (fake snow), then a layer of cranberries were put down and topped with a chubby candle. Very elegant!
A mistletoe made of a styrofoam ball, leaves and a few cranberries here and there is sure to get people smooching.
Make add cranberries and water to a metal baking pan. When frozen, chip the sheet apart for festive ice bucket ice chips.
Using pearl-head pins and a foam cone produces some mod trees. Perfect for a mantle or table- scape.
Primary pic via Craftmodo, who shows us how to make old fashion popcorn & cranberry garland.