Light Paint Live is a webcam program that lets you paint with light!
It’s great for amateur and professional light-painters alike. Amateurs can use it to experiment with light painting without having to buy an expensive camera, and pros can use it as a heads-up display for their DSLR camera.
Light Paint Live (LPL) is a new creative medium for photography. It shows pictures developing in real-time! In addition to emulating long-exposure photography, it also has controls that affect how the light is captured – like color-shift, and light-threshold. LPL applies effects in real-time, without any post-processing!
Visit the site, check out what it can do, and try it for yourself: LightPaintLive.com