In the Ukraine it is good luck if you find a spider web in the house on Christmas morning.

There once lived a woman so poor, says a Ukrainian folk tale, that she could not afford Christmas decorations for her family. One Christmas morning, she awoke to find that spiders had trimmed her children's tree with their webs. When the morning sun shone on them, the webs turned to silver and gold. An artificial spider and web are often included in the decorations on Ukrainian Christmas trees.