I'm looking for a large red button with some sort of casing similar to this http://www.amazon.com/Dream-Cheeky-902-Electronic-Reference/dp/B004D18MCK/ref=sr_1_1?s=electronics&ie=UTF8&qid=1337570009&sr=1-1
Has anyone seen this?
Do you want it to be functional? Maybe this: http://www.amazon.com/Mushroom-Emergency-Stop-Button-Switch/dp/B004U4911Q/ref=pd_sim_sbs_e_8
When I designed semiconductor testers at IBM, we always had to include that big "Emergency off" button that removed all power.
An alternative might be to use a missile cover style of switch. They are cool too 8) see this link
http://www.maplin.co.uk/missile-style-toggle-switch-cover-37319?c=froogle&u=37319&t=module