We put carved pumpkins in all the windows visable from the street and carved pumpkins out front too.
We also have a full size coffin that sit on the front porch, usually with a skull and bones hanging out. We do decorate- but everything is realistic-nothing blowup, etc.
I'm about to go to the next town to find more candy corn and pumpkin decorations! (Like I need them, lol.) Last year, I added what might be called primitive Halloween lollipops to the front yard. Inside, we added this cool Halloween tree from Target.