I read the book A CASE OF ORIGAMI YODA and it had instructions on how to make an origami Yoda (2nd picture). It also had instructions for an emergency 5 fold origami Yoda and here they are
you will need:

paper (size not specified)
pen

I would have used green paper but I couldn't find any at Instructables HQ and also, if it's an emergency, then I don't think you would just happen to have green paper in your pocket.

Step 1: Starting

Position the paper landscape.

Fold the paper into thirds.

Make sure that you crease the paper sharply or your Yoda will deform.

Step 2: The Ears

Fold corners outwards - these will make the ears.

Try to make them as even as possible, but if you don't quite get them straight, don't try refolding them because the extra folds can ruin the shape (plus I think a crooked ear makes him look cute).

Step 3: The Head

Fold down the top over up to the tips of the ears.

Mmake sure you make the crease along the top of his face very sharp, otherwise he will always be looking up.