Here's a few I found. 
[hider= Ghost images] 
[img=http://cherokeebillie.files.wordpress.com/2011/09/ghost.jpg]
[img=http://fc08.deviantart.net/fs51/f/2009/301/7/e/Ghost_Man_by_mudermeart.jpg]
My personal favourite is this
[img=http://clydetressler.net/wp-content/uploads/2009/11/ghost-man-with-ghost-dog.jpg]
[img=http://static1.wikia.nocookie.net/__cb20120817075923/spiderwick/images/3/36/Will-o-the-Wisp-female.jpg]
[img=http://fc03.deviantart.net/fs70/i/2012/291/0/8/custom_adopt___will_o___the_wisp_by_nestery-d5i6jx6.png] [/hider]