Some days ago, I went onto a forum, and found a topic about infrared camera stuff. I checked it out, and found, that if you point a remote-control on your camera and press the buttons, you can see on the camera's LCD (provided it's digital ofcourse) screen, whether or not your camera can pick up infrared lighting. The remote-control will emit weird purple/red/blue light.

I found that my camera could do this, so I read further, and found, that it's pretty easy to make a visible-light filter. It's quite simple actually. You just take some exposed and developed colour film, and take the ends that are completely black. Get two of these, make them cover your lense, and bam, you have a visible-light filter.
Now that you've isolated most of the visible-light, you can take pictures of the infrared light. Also called IR.

I've made a pretty smart filter myself, that filters out just about enough visible-light. This creates a very cool effect. I have yet to take good pictures, but here are 2 poor samples.





So, what do you think? If the weather fits me, I'll go take some better close-up pictures tomorrow. Pictures taken on distance seem to get blured.