You could try taping the bottoms of all of the mice (mouses?
). Just a small piece of scotch tape over the light sensor thing will make them not work. We do it to each other all the time during design (and of course, I'm not affected by it, since I'm apparently the only one who uses the touchpad with Inventor o.O).
Instead of glitter glue, which could probably make the soap dispensers not very happy, you could just mix glitter in. Same effect, really, just less...sticky.
Can you guys ziptie lockers?