Credit also goes to this post on IKEAhacker http://ikeahacker.blogspot.com/2008/08/dishy-lamps.html
Ikea says, quite believably, that their products are green. Please don't make a trip out to Ikea just for this.
Please vote for this instructable in the Epilog Challenge
Step 1: Materials and Tools
Ordning Colander http://www.ikea.com/us/en/catalog/products/90011829 (on sale)" $4
Hanging lamp cord (usually in "as is" section): $0.50
Compact Fluorescent bulb (It's easy being green): $7
Dremel tool with cutting disk
Metal file (optional)
Step 2: Marking Out a Circle
Step 3: Cutting the Circle
If you have not used a dremel tool to cut metal before, I would recommend starting well inside the line. It is so much easier to make the hole bigger if it turns out to be too small than to make it smaller when it turns out to be too big.
Try to keep the dremel tool's wheel vertical, to keep the cuts cleaner. Turn it on, and slowly touch it to the colander, and put very light pressure on it, while holding it firmly. As soon as it is through the metal, lift it up, and move to the next cut. It took me 10 cuts to complete the circle, (okay, the decagon) but this is not an important number.
The hole does not have to be perfect, although it is a good idea to smooth the edges a big, either with a file or the dremel tool. As you can see, the hole will not be anything like the pretty circle we drew.
Step 4: Fitting the Fixture
Step 5: Hanging the Lamp
If you do not already have a lamp hanging there, you will have to install an electrical box.
Before you start making holes in the ceiling, talk to someone who knows what they're doing. You probably have a friend who is at least an amateur electrician. If you do not, befriend an electrician, or someone who has done it before. The people at Home Depot count.
Seriously, don't start messing with electricity unless you know what you're doing. Hanging a lamp could be a whole other Instructable. As soon as it exists, I will link to it. For the time being, just talk to somebody that knows what they're doing.
Step 6: Variations
Err on the side of caution, and only use things that won't crush you, melt or burn.
Have fun with it. If something exciting happens, tell me about it in the comments.