You know that spindle-y, cotton-y, faux spider web material they sell in the plastic bags?
I hate that stuff. First, it's gross and creepy; as in, not a cool, eerie Halloween way, but in a octogenarian's chin hair kinda way. And, it's nearly always misused to create a melty cotton ball look that looks nothing like an actual spider web.
But, this process it pretty intriguing. A special balloon-strengthening product called HI-FLOAT is allowed to dry inside an inflated then deflated ballon, and upon re-inflation, produces a string-y, bizarre, somewhat similar to an spider web looking thing, which, when combined with a few plastic creepy crawlers, looks pretty awesome.
See how its done at Crafty Crafty