Any ideas for using dried ghost chiles?

Heat them in a medium pot with a neutral oil like canola or grapeseed = infused ghost chile oil. Infused into vodka for a unique spicy spirit. Could also infuse into simple syrup for cocktail mixes.

I would grind them (be careful--grinding can create a fine dust that will aggravate your respiratory system and eyes. Be sure to let the dust settle before opening the lid of your grinder). Then you can use a pinch whenever you want to add heat to a dish. Be careful with amounts, though: you can always add more, but you can't take out what you've already put in.

Dark Chocolate Brownies

You can make your own vinegar based hot sauce. Soak them in hot water along with some other dried chiles of your choice (stem and seed first), and when they have softened after a couple of hours toss them in a blender with salt, chopped garlic and maybe a half cup of white vinegar. Liquefy. STRAIN and now you have hot sauce.

Home defense system? Sorry, couldn't resist.