Candy is an integral part of the overall decorations, and neglecting it would be stylistic suicide. Your friends will appreciate your helping them to put on their obligatory five to seven pounds from Halloween without having to actually walk the streets first. Maybe Fiona Apple has been convincing people that pumpkins are raised in cruel conditions. Pumpkins-shaped bags for your fall leaves are always a good idea. There are plenty of good pumpkin and skeleton decorations out there, so there is no reason to risk offending people.
Lighting is extremely important to any decorating scheme.
Strings of Christmas-light type blacklights or strings of lights with pumpkin or skull shapes on them are excellent. A normal blacklight will also give you a nice effect and will work especially well with imitation spider webs. Candles are an excellent addition to any Halloween montage. A few candles can greatly enhance the mysteriousness of your decorations. There are so many different kinds of candles out there that I would be hesitant to recommend anything specific to you, but make sure you get something that works with the rest of your decorations.