It's a colorful festival -- orange and/or yellow pumpkins (mostly Jack-o'-lanterns, of course), white ghosts and skeletons, black bats, colorful witches (depends on the witch but usually you may see at least 2-3 colors on them), gray zombies (and others), black spiders (and others), yellow scarecrows (and others), bloody (red) things (I dislike them, because I don't thing Halloween has to be related to bleeding, hurting, blood, violence, etc., but it's the nowadays reality -- some guys just prefer to produce and to sell these bloody things like bleeding hands, bleeding heads and so on), black cats, green frogs, gray owls (and others) and so on, and so on.
It's an interesting festival too. It's full of imaginary subjects like vampires (and those mentioned above -- zombies, ghosts, witches, etc.) and real ones like bats, curved pumpkins, cats, frogs, etc. There are also semi-real things like walking skeletons or talking scarecrows. Everything is like a fairy tale.
It's one of the days when I'm trying (and often -- able) to forget the real problems and to practice a sort of escapism, enjoying this unique festival.
Some people may say "Then why not Christmas or something like that?" and my answer is pretty simple: the subjects of Christmas are pretty limited (Santa Claus, X-mas trees, deers and some others), plus the Christmas is related to coldness (winter, snow, ice). I do prefer the autumn colors and the autumn warmness of the Halloween (well, sometimes it's rainy and it's really a sort of "sad Halloween" to be honest... )
That's it. Stay safe and be happy!