It's called Glo Balls, I kid you not. [Insert joke here.]
I have no idea if "Glo Balls" existed before, or if this is something completely new. I tend to walk past the Hostess aisle of the grocery store and make a beeline for the Oreos and Pepperidge Farms instead, but now I'm going to keep an eye out for this.
Pic shamelessly stolen from here.
Do they glow in the dark? Do they disintegrate if you put them too close to a bottle of mustard? Is Hal Jordan's costume really made of sparkly coconut sugar? You be the judge.
If you look in the background, you can see "Flash Cakes," which sounds a lot classier.