Step 3: Use it for cleaning
Scrubber: Ball up some aluminum foil and use it to scrub off the nasty, stuck-on messes that get left behind on your non-non-stick pots and pans. This is great for those times when you cook, say, a casserole with some foil on top. You can use the same foil for clean up and then recycle it.
Protect soap bottoms: I haven't used bar soap in forever. Not because I'm averse to washing, but because my soap dissolves into a damp, squishy mess before I get the chance to use it all up. But with a little bit of aluminum foil, I might be able to keep my bars of soap alive long enough to actually use them. To protect your bars of Ivory, just put a layer of aluminum foil on the bottom of your soap. It will protect your soap from melting slowly like the Wicked Witch of the West getting waterboarded at Guantanamo. And it looks nice next to a stainless steel basin. Very modern.
Slide furniture/ protect feet and legs: Sliding furniture around on carpet is sometimes a pain. They sell special furniture-sliding disks for this purpose, but I don't want to buy something just to adjust my couch a few feet. Some aluminum foil on the bottom of the legs allows you to slide your davenport around cheaply and easily. You can use a little extra foil and make some furniture leg-warmer-style protectors when you're mopping or staining or setting your Roomba loose.
Foil the fireplace