Toilet paper

When it comes to folding, toilet paper has some major drawbacks, like the awkward rectangle dimensions instead of the square normally used as a basis in origami. It does have a really big advantage though in being presented right in front of you on a moment you don't have anything else to put your mind on for a while. And as the alternative is being flushed down the toilet it doesn't really matter where any random folding takes it.

All the foldings above are freely improvised while on the loo, and are all folded from a single sheet of toilet paper (without cutting or tearing).