Paper snowflakes - they are too tricky for younger children to cut out, so I pre-folded papers and had them draw a design with pencil. I cut the shapes out but they felt like they personalized each one.
Paper mittens - the children always love having their hands and feet traced. This way they could decorate their own mittens - lots of pink, purple, and sparkles!
Michael's craft had these large 6 inch snowflakes. All of the kids loved painting them and picking glitter too (we did end up with one covered in purple glitter.)
Fluffy cotton ball snowmen. The children customized their own snow girls after we read "What Snowmen do at Night."