Here is an awesome light show effect that you can do at home with a laser pointer. 

I used line lenses that I got from eBay for a couple bucks to do this effect.

Check out http://laserpointerforums.com to learn more about laser pointers, lasers, and laser pointer companies! I have been a member there for 8 years, and have received a bunch of help from the knowledgeable members there!