Popular Science has starting instruction on their How 2.0 Blog for building your own X-Ray vision camera. They are quick to point out one of the potential issues with building the camera:
You’ve seen them in the back of magazines–heck, probably Popular Science–all your life: the crazy swirling paper X-ray specs, with the campy ’50s pervert looking at the bloomers of a shocked gal. While we don’t support such nefarious uses, you can make your own working X-ray camera, just by modifying a CVS Disposable. It won’t give you Superman vision, but you should be able to see through one or two layers of paper and fabric (again, behave!) in the right light. Here’s the catch: The key is in a hard-to-find X-ray conversion material called a beryllium window. PopSci got its sample from NASA during a visit to the Goddard Space Flight Center a few years ago, as it is sometimes used in satellites to block out cosmic X rays that might distort digital communications.
So if you don’t have friends at Goddard, you might want to start looking now for another source of a beryllium window (a quick search of ebay turned up zero, so don’t think it’s that easy). Still, I think the results show this to be worth trying to get and build anyway.
[tags]Build your own X-Ray vision camera, PopSci X-ray camera instructions[/tags]
I don’t know why you would want to do this, but it seemed funny enough to me that I thought I’d point you towards a guide on 
This is another “I know I’m late posting” post, but I didn’t want this to get away without at least making mention of it. If you are in to 
I’ve seen a lot of 9V battery based USB chargers. Most seem built around an Altoids mint container. 
uploaded photo and turn it into a five-tone grayscale grid of 1×1 bricks from which you could create a wall-hanging mosaic. 
Of course, I like shiny things, so it might not as cool to others as it is to me. 
On this page i will explain how i created my own colour changing lamp with red, green and blue leds that fades between all colours of the rainbow. It really comes out well at night when other light are dimmed. In daylight conditions the colors aren’t noticed well. 
Although it’s low budget i must say the result is nice. Here are some photo’s of my lamp in action. Click on any foto to see it in a bigger size.
4 AAA batteries which power this lamp for 10 hours non stop light effects.
In the near future i am planning to make more of these lamps but with other housings. I now know things i can do better in future lamps. For example buy diffused leds instead of transparant ones and with a bigger opening angle (however i solved the latter by rubbing the leds with sandpaper, but still…).