Humbly requesting the assistance of the DiS hive mind.

We're doing a meeting at work for some clients where we need lots of lighting things to keep them 'entertained'. I've looked into glow sticks, glowing cups(!) etc. I even googled 'buy wicked lasers' and found this: http://www.wickedlasers.com/krypton (which is $700, but I suppose that reasonable for a WICKED LASER). But I've run out of steam.

Any ideas on stuff that lights up that you could use to decorate a room? Joke suggestions welcome.