Just visited my ex-girlfriends brothers blog (Pieter Stoaling) and he has posted an interesting blog about light painting, using a torch or candle, leds, phones, anything that creates a light to draw within a picture as long as it is dark and has a low iso setting and long shutter release. It's good fun and doesn't affect anyone adversely, like a form of harmless graffiti.

I have used this technique before to achieve interesting effects at gigs and concerts, but I once did it a couple of times with an old film camera, and you never entirely sure how it was gonna turn out until you went and got the film processed.

For this kind of thing you can buy an old cheap (but still good) slr camera off of ebay for a cheap price or even buy a camera of the lomography website which is still very popular.