ok, let me think, this should be fun. Let me just say that I don't think it's nessesarily a good idea to keep large amounts of money in your home. But, for a little stash....
1. In a ziplock bag taped to the inside of your of your fireplace above the door or window. This is only if you don't use your fireplace of course! and make sure everyone else in the house knows not to use it either!
2. In several layers of well sealer plastic bags at the bottom of potted plants burried in the dirt. Put it up against the side so it doesnt' obstruct the water flow and so it can't be seen from the drainage holes. Deep enough that it won't uproot when the dirt settles as watered. Make sure it isn't a plant pot that would be throw out of the way and broken during a robbery.
3. put it in a box of tampons and reseal the box.
4. If you DON'T have cats: buy a litter box, fill it with litter, put the money at the bottom under a thin piece of hard plastic or cardboard. Throw in some water to create some clumps in the litter to make it look like the kitty has been using it.
5. outside in a birdhouse that isn't likely to be bothered by neighborhood kids or the like. Bag the money put it in the bottom, cover it with some straw or hay then tack a piece of plastic to the inside of the hole (covering it) so birds can't peck their way in. I know, mean but, just make sure to put up a couple real birds houses to make it up to them. Keep the bird house up high and out of reach just in case.
**DON'T put it anywhere in a bedroom, behind/inside photo frames or paintings, in books, appliances, cans or jars, toilet tanks, CD or DVD cases, in shoes or shoe boxes, or under/in garbage cans (robbers often steal trash cans to later sort for documents, bank statements, etc).