The perfect indoor activity on a cold, cold day - build a blanket fort!  Why not read The Fort That Jack Built when you get inside?   Pillows, a blanket and clothespegs and twine and more  books to read -- no need to whine about the snow or having no place to go.  A  flashlight will help make the books easier to see.  Bring a few stuffed animals in and some toy dishes for a tea party!  So much fun!