Here's something I've always wanted to try so I gave it a shot (pun intended) tonight. I started off simple with just a cross since I had never done this effect before. This picture is just a four second exposure and I am drawing in the air with a blue led light. I did put a little side light so that you can just see a little of my face because I liked the added dimension to the picture. I spent about ten minutes and took about a dozen shots with varying amounts of light and cross sizes, none of which were that great. Here's what I thought was the best one, meaning it was fairly centered and lit the way I wanted. It's kind of hard to center yourself in the frame when you're in the dark and you only have ten seconds before the camera begins the exposure to make it to the spot you think is centered. I'm sure I'll try more pictures like this later because I had a lot of fun trying this effect. 
the cross is cool...the slight image of you lurking in the background is a bit creepy... smiles!
I'm glad you showed this to me last night (and yes, it was definitely last night). You constantly amaze me with your creativity.
That reminds me of when I grew my thanksgiving to christmas beard a couple of months ago. One of our sixth grade girls hadn't been to church in a few weeks, and when she saw me, she said:
"eeewwww. You look creepy."
So, there you go. Two "creepy" labels in two months. Man, I feel good about myself! :-)
I'm sorry...you have to admit that you are kind of hovering there rather ghost-like...
yeah, well it needed something else since I couldn't get the cross perfectly centered in the shot. I also don't like cropping or altering pictures, so that wasn't an option for me.
Maybe next time I'll get someone else there who can look through the eyepiece and get me centered where I need to be. I just couldn't do that by myself.