I built a homemade flash diffuser from paper:
It diffuses the flash, while at the same time directing much of it to the direction of the subject. Of course, some flash power is wasted by lighting up the ceiling (the paper transmits some light through), but at least there's some directionality.
It achieves excellent results (on the left, with diffuser, on the right, direct flash):
My question is, are there any similar diffusers commercially available? Of course I don't mean an exact replica built from paper, but rather a more durable diffuser that achieves the equivalent functionality and is somewhat directional like my DIY diffuser.
By a diffuser, I mean something that can be used on the camera and something that is so lightweight it's feasible to carry it and the camera around. Of course, with an off-the-camera flash, you can use umbrellas, but they are too large to be carried around.