Candles in the Fireplace - especially wood wick candles, as they actually Crackle. Great option if your fireplace is non functional, you have spare the air days as we do, or for summer time when its just too dang hot!
Nail Holes How To: Make paper templates. Mark on each paper template exactly where the nail should go. Nail templates onto wall, nailing at the marks. Rip off the paper templates, and hang pictures on the nails.