I hadn't seen any origami-fold tutorials on here, so I decided to make one, even though my baby is asleep and I don't have any big stuffed animals or dolls. Oh, and the only place I could do the tutorial was in his crib (he's in the bassinet right now).
Anyway, I hope this is useful to someone

The origami fold is waaay easier than it seems and works so well, and is quite trim (my baby weighs 15+ pounds and can wear an origami-folded flat in his XS Thirsties cover still!)

Flat!

Fold top to bottom.

Fold left to right.

Pick up the lower right-hand corner of the top layer of fabric. Pull it to the left so you get a nifty triangle.

Nifty triangle.

Pick up all the layers of fabric on the lower right-hand corner and flip over the diaper to the left.

There's now a square of extra fabric.

Pick up the square (not what's underneath it, just two layers of fabric) and fold it in half.

Fold it in half again.

Oooh, pretty.

Turn it around and fold it down in the back (or front, though I think you'd have to roll in the sides to make that fit right)

Put your baby on the diaper and fold up the front.

Bring the sides in around the legs, and pin or snappi (you can fold in the extra little tails however you want, but I usually just leave them. With bigger babies you probably won't have that excess anyway)
I think I included/explained everything. I hope nobody had done a tutorial for this already, haha.