Print each letter and the numbers for your classroom. The small snowflakes are included as printables. The larger snowflakes I created by folding a piece of anchor chart paper and cutting randomly. Youtube has many tutorials for creating paper snowflakes. It would also be fun to allow your students to create their own snowflakes for the door. 

Fonts are KG Blank Space and Hello Sip Medium.

Print on colorful cardstock in whichever color you choose.