Step 1: Things You Need !
1) Camera where you can keep the shutter open for longer time. I have DSLR Cannon 50D and Wide lense by Tammaron(Lense are User specific).
2) Lazer Light (Any color can work i have Green)
3) Background where you want to project the laser image (User Specific and individual Idea & Planning). I used My Room Interior with city view in background through window.
4) MOST IMP Tripod
5) DARKNESS for few specific imaging ( again user specific Sky is the limit, Bright laser work well in bright room too)
Step 2: What to Do & How to Do.
On TV mode in Cannon you can set timer for the shutter to remain Open.
Set the Camera on TV mode and focus the wall in-front where you would like to project the laser art. Place some object close to wall and set the lens on Manual focus and adjust it until the object is clearly focused.
Once you had set the focus on Wall /object where you would cast the laser art then switch off the light and then go to Menu of the camera and set the Shutter timer to 32sec (user specific) for longer and creative laser art.
After you set the Shutter timer also adjust the Brightness in range of -2....0...+2 to get best effect.
Also set the Timer for photo click to 2 sec or 10 sec (So you can prepare yourself before the shutter open).
Then Get Set GO....