It really all depends on what you're using them for. If you've got a Ford Focus, a pair of ramps rated to stand up to 5k lbs is more than enough. Just make sure you chock the rear tires, and use the e-brake. If its a truck, and you're not able to get a jack that'll get it high enough to use the jack stands.... then you should used both.
I've never really been a fan of creepers. One pebble and it gets stuck. Creepers belong in garages that are made to utilize them. IE: some kind of hard flooring(not just concrete), and a drain or two. You don't want to be trailing oil out from under your bucket
Cardboard ftw. It soaks up spills, and protects you from banging your elbows directly on the hard stuff. Also, most of the time it is free
