This PDF has printable letters that read "There's snow better time to read!" The smaller letters are 5" circles and "READ!" letters are 7" circles. (If you want smaller circles, just scale the document size before you print!)
I suggest cutting out paper snowflakes and adding them around the letters. I also printed out and laminated book covers that were winter-related and decorated with those as well.
NOTE: This printable only has the letters. The snowflakes are not included.