After trying your hands on this ultimate matchbox pinhole camera, you won't feel like throwing your empty matchboxes anymore. This simplest of DIY requires just a matchbox with a pinhole shutter, lightproof tape, a roll of 35mm film and a few of your precious minutes.

The matchbox camera will deliver 24 x 24mm of square images (Check out few of them here). This means you can make your 35mm film churn out at least 50 impeccable shots.
But if you think big, better try this or this or this.
Thanks: Alspix and James
Via: Retrothing