DIGITAL PINHOLE.

Equipment needed:

DSLR - Mine's Canon 400D
Spare Body Cap - I got mine for 99p on Ebay
Candle
Tweezers
Needle

Adult - for those of a young age

Light Candle, hold needle with the tweezers (in-case needle gets too hot to hold) and place needle tip in flame just at the tip of the blue part in a flame (the hottest bit).

When the needle is hot enough place hot needle on centre of the Body Cap and repeat until needle has gone through to the other side

You're done!

Some results:

Focal Length 0mm
Exposure Time 8 Secs
ISO 1600

Focal Length 0mm
Exposure Time 13 Secs
ISO 1600