You could do the BOO letters in Black, Orange, and Green. You could do something similar with FALL. Front Door Decorations for Halloween. Could do FALL instead in brown with orange ribbon so it could stay up for more than just Halloween
Spider Mexican dip. I made this last year and it was very easy. The web is sour cream and you use a plastic bag or cake decorating tools to make the web. I really want a cauldron bowl now for the chips!