As usually Google did a great job putting their halloween Google logos galore:
They even offer you a help to get into the Halloween spirit by "Halloweenify" your google plus profile photo:
Tomorrow is All Saints' day(All Hallows day, or lately just All Dead day). That holiday we celebrate in Poland, and most Western Christian countries. That one is much more reflective, sad day in which we remember all the people that are gone. We visit the graves bring flowers, and light the candles for their souls. Prior to that day many organizations taking on themselves to clean up the graves of those whose families are lost, or unknown, such as fallen soldiers of World Wars and old historical cemeteries.