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
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.