Wow, great idea.

I'm doing a mock window with a scrim effect.
I'm using a small closet that has folding doors. I'm opening the doors and hanging curtains to hide the doors. Then I'm hanging my black material (scrim). Behind that I am hanging a clamp light that is contented to my FX box and a silhouette. I'm putting a CD player in with a CD that is only thunderstorms. So when the thunder sounds, the FX box sends power to the lamp and it flickers to the thunder and lights my silhouette making it look like someone is standing at the window.

That might make a good Hallowindow idea too!

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Spectorized