Sometimes you could find useful let your flash still in a place and take your photos all around. This is pretty true in case you're making a 360° panoramic photo. You can't move your light source from a shot to the other because in assembly process you'll see the differences in the shadows.
You'll work better with a slave-flash, but also a cable connected one is good. Then you need a diffuser to make the light reach all 360° around you. You can build it yourself, ops you have to built yourself, because I think it doesn't exist! ...if it doesn't exist it shouldn't be so useful, you say... right, or maybe I'm a genius! ;-)
Anyway, this is what Instructables is intended to, let's build it!
Step 1: The glittering container
You're lucky because you can use the same container which is part of the Flash Grid Snoot
(and after the efforts you had to put into finding it among all the hand soaps it's better it attends to something else).
Sorry if I post some images you've already found on the other tutorial... I could have posted all in one, but I though it also could became annoying.
Step 2: Let's heat it
For the ones who hadn't the pleasure to read my other Instructable (go to read it asap!) you have to cut the container (make it about 8 cm long) and to heat it on a flame, so it fits the flash head. Remember to wrap the head of your flash with some package tape. Then twirl continuously it over the flame (the container, not the flash!!) so it shoudn't melt.
Step 3: And fit it
Wrapping the flash head with packaging tape you'll obtain a double goal. First you shouldn't damage your (very) expensive flash and second you'll have some thickness to make the diffuser fit better to it.
Once your container is soft you could try to fit it onto your flash, then wait it gets solid, take it away and remove the tape to check it fits with the right tension. It's better it's a little loose because my plastic tends a little to recover original form.