Moonflower light tunnel = safer alternative to green laser vortex?

I'm still uncomfortable with the idea of pointing a green laser vortex at an audience, due to real or merely perceived safety issues. But searching around on YouTube I found what may be a cool and safer alternative - using a DJ style moonflower light plus fog. I'm interested in potentially setting one of these up in my two car garage. Here's the video I found. It also reminds me of the light tunnel effect seen at the beginning of Epcot Center Norway's Maelstrom ride, where you're starting to ascend at the beginning of the attraction:


In a garage, it should be dark enough and I wouldn't have to worry about wind dispersing the fog too quickly. However, it wouldn't be a Haunted Garage. Don't want it to be a walkthru or to attract interested trick-or-treaters. Is there any kind of inexpensive mesh netting I could hang to the outside of the garage door to discourage anyone trying to walk into the garage? Maybe like those child safety pool screens you sometimes see.

Wonder if there's something strong enough to keep little kids out. But that would let enough light in to see the moonflower light tunnel. Also makes me wonder about scrim. Having some sort of cool scene in the garage, viewable from the driveway part of the time, e.g. front lighting it, then backlighting it on a timer.

Anyway, I think the guy mentions using a ~$150 American DJ moonflower unit. That's a bit out of my price range. Any other model suggestions? Recently saw a large rotating multi-color "globe" light at Party City for $15. Can't help but wonder if I could mount it horizontally rather than have it stand vertically, and sub that in for a moonflower light tunnel effect. Don't know if it would be bright enough. Or if I could mod it to use a brighter light bulb.

Here's the Party City item:

Spinning Rainbow Light 9in SKU: 215559
http://www.partycity.com/product/spinning+rainbow+party+light.do?from=Search&navSet=spinning%20rainbow%20light