False Stair Tread
It takes some effort, but if you can, free a tread from your stairs. Then attach a piano hinge to the back. It'll be almost invisible and you'll have a good place to stash valuables.
Roll up some cash, stick it in a medicine bottle or any other watertight container, and bury it in a potted plant. For quicker access and to keep dirt from getting under your fingernails, place a stone or pine cone over it. Not many burglars are going to be excavating around your houseplants.
Pick a deep drawer so the depth change won't be obvious. Cut 1/4-in. plywood 1/16 in. smaller than the drawer opening and rest it on a couple of wood strips that are hot-glued to the drawer sides. Then hot-glue some item you'd expect to find in that drawer to the bottom so you have a handle to lift the false bottom and reveal the booty.