never seen the clothes thing, but the paper bag most definitely has magnetic properties. usually, ones with handles are most fun, because once inside the bag, you can snatch up (with said handles) a Bag O' Kitty.
also: whatever toys you buy are of negligable value. wadded up paper is key. for my sister's cat, we used dollar bills wadded up. actually, one time my gf found this paper that has catnip on it and you wad up the paper and they bat it around like crazy. the paper ended up being soaked with cat drool. but very entertaining.