It's not rocket science. I've mentioned on the board before that my girlfriend will buy me anything with Pac Man on it...when she saw Pac Man Light switch covers on ebay, she asked me if I wanted them, I told her If I wanted them I'd make them myself! Anyway, I made some myself and thought I'd share my template and some examples.
Like I said, it's not rocket Science..but we all have lights in our game rooms, right? So...i thought it'd be cool.
BTW, these should fit the clear covers you get at Lowes, the ones at home Depot are taller for some reason. (ManufacPart # 64614) I can't find a link to it on Lowe's site..but They had them at my store, made by Brainerd (on the back it says libertyhardware.com)

My Teplate can be downloaded here (right click and save):
http://allroy.bigdrillcar.com/mame/pix/LightSwitchTemplate.psdAllroy