How to take a light grafitti picture with Nikon D70? - 1

I have a Nikon D70 camera. I'm wondering what the best mode is on the camera to capture light graffiti the best? Thanks. Additional tips for it would be great too!

Put your camera on a tripod, and use either the self timer or an external shutter release.
Set your camera to a long exposure (say between 15 and 30 seconds, although you might want it much longer than that, depending on your project). Not all little P&S cameras can do this. The shorter time you have, the more limited you are in what you can do with it.
Refer to your manual if you don't know how to do something - you should know that book inside out, anyway (if you lost it, download a new one from the manufacturer).

Make sure you are in a very dark room/area. It helps to have an assistant dressed in dark clothes - less chance of showing up in the shot. Use pretty much any light source you can think of, experimenting with it is fun. Also play with different ISOs and apertures to see the differences there. It will turn out a good learning experience, as well.

So once everything is set up and ready, click your shutter button/timer and have your assistant move around with the light source. Have fun trying to make different designs, all the way from some random squiggle to carefully planned and executed designs.

P.S. Some people call it "painting with light" which is actually a very different technique. Here is an amazing video about it: http://fstoppers.com/night-photography-how-to-paint-with-light/

For proper light art you need to use the camera in bulb mdode, where the shutter remains up as long as you hold down the shutter button. The best way to do it is using a remote release.

So, put your camera in full manual mode and switch to bulb mode.
The first press on the remote opens the shutter, the second click closes it.
Wear dark clothing and keep moving. As long as you do not remain in one spot but continue moving you will not appear in the photograph but can continue to paint with light.
The longest you can keep the shutter open for in bulb mode is 30 minutes. If you do keep it open for long periods like that, make sure to give the sensor plenty of time to cool time both to prevent damage to it and to prevent hot spots appearing in the picture as the sensor overheats